RhythmOne plc (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 000 - Document - Document And Entity Information Network

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 http://www.rhythmone.com/20180331/role/statement-document-and-entity-information
2 Document Information [Table] Table

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 dei:DocumentInformationTable
3 Legal Entity [Axis] Axis dei:LegalEntityAxis
4 Entity [Domain] Member dei:EntityDomain
5 Document Information [Line Items] LineItems dei:DocumentInformationLineItems
6 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
7 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
8 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
9 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
10 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
11 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
12 Entity Voluntary Filers Concept (Yes/No) For Period dei:EntityVoluntaryFilers
13 Entity Well-known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
14 Entity Common Stock, Shares Outstanding (in shares) Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
15 Document Type Concept (Submission Type) For Period dei:DocumentType
16 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
17 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
18 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
19 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
20 001 - Statement - Consolidated Income Statements Network

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 http://www.rhythmone.com/20180331/role/statement-consolidated-income-statements
21 Statement Table [Table] Table

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 rhyth:StatementTable
22 Legal Entity [Axis] Axis dei:LegalEntityAxis
23 Entity [Domain] Member dei:EntityDomain
24 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
25 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
26 Cost of revenue Concept (Monetary) For Period Debit ifrs-full:CostOfSales
27 Operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpenseExcludingCostOfSales
28 Loss before tax and finance income and expense Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
29 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
30 Finance expense Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
31 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
32 Loss before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
33 Income tax recovery Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
34 Loss from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
35 Loss from discontinued operations, net of tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
36 Loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
37 LOSS PER SHARE ATTRIBUTABLE TO RHYTHMONE plc Abstract ifrs-full:EarningsPerShareAbstract
38 BASIC (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
39 DILUTED (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
40 LOSS PER SHARE FROM CONTINUING OPERATIONS Abstract rhyth:LossPerShareFromContinuingOperationsAbstract
41 BASIC (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShareFromContinuingOperations
42 DILUTED (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShareFromContinuingOperations
43 002 - Statement - Consolidated Statements of Comprehensive Income Network

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 http://www.rhythmone.com/20180331/role/statement-consolidated-statements-of-comprehensive-income
44 Statement Table [Table] Table

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 rhyth:StatementTable
45 Legal Entity [Axis] Axis dei:LegalEntityAxis
46 Entity [Domain] Member dei:EntityDomain
47 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
48 LOSS FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
49 Items which might be potentially reclassified to profit or loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
50 Exchange difference on translation of foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
51 (Loss) / gains on marketable securities (net of tax) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
52 TOTAL COMPREHENSIVE LOSS FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
53 003 - Statement - Consolidated Balance Sheets Network

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 http://www.rhythmone.com/20180331/role/statement-consolidated-balance-sheets
54 Statement Table [Table] Table

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 rhyth:StatementTable
55 Legal Entity [Axis] Axis dei:LegalEntityAxis
56 Entity [Domain] Member dei:EntityDomain
57 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
58 NON-CURRENT ASSETS Abstract ifrs-full:NoncurrentAssetsAbstract
59 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
60 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
61 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
62 Other receivables and restricted cash Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentFinancialAssets
63 Deferred tax asset Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
64 Marketable securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssets
65 Non-Current Assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
66 CURRENT ASSETS Abstract ifrs-full:CurrentAssetsAbstract
67 Trade receivables Concept (Monetary) As Of Debit rhyth:NetTradeReceivables
68 Other receivables and restricted cash Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
69 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
70 Current portion Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
71 Current Assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
72 TOTAL ASSETS Concept (Monetary) As Of Debit ifrs-full:Assets
73 NON-CURRENT LIABILITIES Abstract ifrs-full:NoncurrentLiabilitiesAbstract
74 Deferred tax liability Concept (Monetary) As Of Credit ifrs-full:NetDeferredTaxLiabilities
75 Other payables Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentPayables
76 Borrowings Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
77 Provisions Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
78 Non-Current Liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
79 CURRENT LIABILITIES Abstract ifrs-full:CurrentLiabilitiesAbstract
80 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
81 Term loan Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
82 Provisions Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
83 Current Liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
84 TOTAL LIABILITIES Concept (Monetary) As Of Credit ifrs-full:Liabilities
85 NET ASSETS Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
86 SHAREHOLDERS’ EQUITY Abstract ifrs-full:EquityAbstract
87 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
88 Share premium account Concept (Monetary) As Of Credit ifrs-full:SharePremium
89 Shares to be issued Concept (Monetary) As Of Credit rhyth:SharesToBeIssued
90 Share-based compensation reserve Concept (Monetary) As Of Credit ifrs-full:ReserveOfSharebasedPayments
91 Currency translation reserve Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslation
92 Merger reserve Concept (Monetary) As Of Credit ifrs-full:MergerReserve
93 Accumulated other comprehensive (loss)/income Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
94 Retained earnings / (Accumulated deficit) Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
95 TOTAL EQUITY Concept (Monetary) As Of Credit ifrs-full:Equity
96 004 - Statement - Consolidated Statements of Changes In Equity Network

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 http://www.rhythmone.com/20180331/role/statement-consolidated-statements-of-changes-in-equity
97 Statement Table [Table] Table

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 rhyth:StatementTable
98 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
99 Equity [member] Member ifrs-full:EquityMember
100 Issued capital [member] Member ifrs-full:IssuedCapitalMember
101 Share premium [member] Member ifrs-full:SharePremiumMember
102 Shares to be issued [member] Member rhyth:SharesToBeIssuedMember
103 Reserve of share-based payments [member] Member ifrs-full:ReserveOfSharebasedPaymentsMember
104 Reserve of exchange differences on translation [member] Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
105 Merger reserve [member] Member ifrs-full:MergerReserveMember
106 Other reserves [member] Member ifrs-full:OtherReservesMember
107 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
108 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
109 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
110 Net loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
111 Other comprehensive loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
112 Total comprehensive loss for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
113 Issue of shares, net of costs Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
114 Credit to equity for Share-based payments Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
115 Tax movement on share options Concept (Monetary) For Period Credit rhyth:IncreaseDecreaseFromTaxMovemnentOnShareOptions
116 Issue of shares, net of costs related to acquisitions Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary
117 Capitalization of merger reserve (note 23) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransferToStatutoryReserve
118 Capital reduction (note 23) Concept (Monetary) For Period Debit ifrs-full:ReductionOfIssuedCapital
119 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
120 005 - Statement - Consolidated Cash Flow Statements Network

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 http://www.rhythmone.com/20180331/role/statement-consolidated-cash-flow-statements
121 Statement Table [Table] Table

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 rhyth:StatementTable
122 Legal Entity [Axis] Axis dei:LegalEntityAxis
123 Entity [Domain] Member dei:EntityDomain
124 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
125 CASH FLOWS FROM OPERATING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
126 LOSS FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
127 Adjustments for: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
128 Taxation expense (benefit) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncomeTaxExpense
129 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
130 Share-based payments Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
131 Interest income Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForInterestIncome
132 Interest expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForInterestExpense
133 Impairment of goodwill Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossRecognisedInProfitOrLossGoodwill
134 Loss on sale of computer equipment Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
135 Loss on disposal of PVMG assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets
136 Foreign exchange losses Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
137 Remeasurement of deferred consideration Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
138 OPERATING CASH FLOWS BEFORE MOVEMENTS IN WORKING CAPITAL Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital
139 Decrease / (Increase) in trade and other receivables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
140 (Decrease) / Increase in trade and other payables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
141 (Decrease) / Increase in provisions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
142 Net Cash Flows From (Used In) Operations Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperations
143 Income taxes (paid) / refund received Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities
144 NET CASH USED IN OPERATING ACTIVITIES Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
145 CASH FLOWS FROM INVESTING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
146 Interest received Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsInvestingActivities
147 Purchase of property, plant and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
148 Expenditure on development Concept (Monetary) For Period Credit ifrs-full:PaymentsForDevelopmentProjectExpenditure
149 Purchase of marketable securities Concept (Monetary) For Period Credit ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities
150 Payment of deferred acquisition consideration Concept (Monetary) For Period Credit ifrs-full:OtherCashPaymentsToAcquireEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities
151 Proceeds from the sale of computer equipment Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
152 Proceeds from the sale of the assets of PVMG Concept (Monetary) For Period Debit ifrs-full:ProceedsFromDisposalOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleAndDiscontinuedOperations
153 Proceeds from the sale of marketable securities Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities
154 YuMe Acquisition, net of cash acquired Concept (Monetary) For Period Credit rhyth:CashFlowsUsedInObtainingControlOfMajorSubsidiariesOrOtherBusinesses
155 Acquisitions, net of cash acquired Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
156 Perk acquisition, net of cash acquired Concept (Monetary) For Period Credit rhyth:CashFlowsInPriorPeriodUsedInObtainingControlOfSubsidiariesOrOtherBusinesses
157 NET CASH FROM / (USED IN) INVESTING ACTIVITIES Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
158 CASH FLOWS FROM FINANCING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
159 Payments on finance lease Concept (Monetary) For Period Credit ifrs-full:PaymentsOfFinanceLeaseLiabilitiesClassifiedAsFinancingActivities
160 Interest payments Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
161 Repayment of credit facility Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
162 Proceeds from term loan Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfBondsNotesAndDebentures
163 Funding of collateral related to term loan Concept (Monetary) For Period Credit rhyth:PaymentsForCollateral
164 Proceeds from credit facility Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
165 Debt issuance cost paid Concept (Monetary) For Period Credit ifrs-full:PaymentsForDebtIssueCosts
166 Proceeds from issuance of shares Concept (Monetary) For Period Credit ifrs-full:PaymentsForShareIssueCosts
167 NET CASH USED IN FINANCING ACTIVITIES Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
168 Net increase / (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
169 Beginning cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
170 Effect of foreign exchange on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
171 ENDING CASH AND CASH EQUIVALENTS Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
172 006 - Disclosure - Note 1 - General Information Network

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 http://www.rhythmone.com/20180331/role/statement-note-1-general-information
173 Statement Table [Table] Table

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 rhyth:StatementTable
174 Legal Entity [Axis] Axis dei:LegalEntityAxis
175 Entity [Domain] Member dei:EntityDomain
176 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
177 Disclosure of basis of preparation of financial statements [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
178 007 - Disclosure - Note 2 - Adoption of New and Revised Standards Network

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 http://www.rhythmone.com/20180331/role/statement-note-2-adoption-of-new-and-revised-standards
179 Statement Table [Table] Table

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 rhyth:StatementTable
180 Legal Entity [Axis] Axis dei:LegalEntityAxis
181 Entity [Domain] Member dei:EntityDomain
182 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
183 Disclosure of changes in accounting policies [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfChangesInAccountingPoliciesExplanatory
184 008 - Disclosure - Note 3 - Significant Accounting Policies Network

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 http://www.rhythmone.com/20180331/role/statement-note-3-significant-accounting-policies
185 Statement Table [Table] Table

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 rhyth:StatementTable
186 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
187 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
188 Capitalised development expenditure [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
189 Legal Entity [Axis] Axis dei:LegalEntityAxis
190 Entity [Domain] Member dei:EntityDomain
191 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
192 Disclosure of significant accounting policies [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
193 009 - Disclosure - Note 4 - Critical Judgements and Key Sources of Estimation Uncertainty Network

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 http://www.rhythmone.com/20180331/role/statement-note-4-critical-judgements-and-key-sources-of-estimation-uncertainty-
194 Statement Table [Table] Table

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 rhyth:StatementTable
195 Legal Entity [Axis] Axis dei:LegalEntityAxis
196 Entity [Domain] Member dei:EntityDomain
197 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
198 Disclosure of accounting judgements and estimates [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
199 010 - Disclosure - Note 5 - Segment Analysis Network

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 http://www.rhythmone.com/20180331/role/statement-note-5-segment-analysis
200 Statement Table [Table] Table

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 rhyth:StatementTable
201 Legal Entity [Axis] Axis dei:LegalEntityAxis
202 Entity [Domain] Member dei:EntityDomain
203 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
204 Disclosure of operating segments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOperatingSegmentsExplanatory
205 011 - Disclosure - Note 6 - Discontinued Operations Network

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 http://www.rhythmone.com/20180331/role/statement-note-6-discontinued-operations
206 Statement Table [Table] Table

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 rhyth:StatementTable
207 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
208 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
209 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
210 Legal Entity [Axis] Axis dei:LegalEntityAxis
211 Entity [Domain] Member dei:EntityDomain
212 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
213 Disclosure of discontinued operations [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDiscontinuedOperationsExplanatory
214 012 - Disclosure - Note 7 - Business Combinations Network

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 http://www.rhythmone.com/20180331/role/statement-note-7-business-combinations
215 Statement Table [Table] Table

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 rhyth:StatementTable
216 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
217 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
218 Perk, Inc. [member] Member rhyth:PerkIncMember
219 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
220 YuMe, Inc. [member] Member rhyth:YumeIncMember
221 Legal Entity [Axis] Axis dei:LegalEntityAxis
222 Entity [Domain] Member dei:EntityDomain
223 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
224 Disclosure of business combinations [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
225 013 - Disclosure - Note 8 - Loss For The Year Network

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 http://www.rhythmone.com/20180331/role/statement-note-8-loss-for-the-year
226 Statement Table [Table] Table

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 rhyth:StatementTable
227 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
228 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
229 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
230 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
231 Legal Entity [Axis] Axis dei:LegalEntityAxis
232 Entity [Domain] Member dei:EntityDomain
233 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
234 Disclosure of profit (loss) from operating activities [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProfitLossFromOperatingActivitiesExplanatory
235 014 - Disclosure - Note 9 - Auditor's Renumeration Network

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 http://www.rhythmone.com/20180331/role/statement-note-9-auditors-renumeration-
236 Statement Table [Table] Table

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 rhyth:StatementTable
237 Legal Entity [Axis] Axis dei:LegalEntityAxis
238 Entity [Domain] Member dei:EntityDomain
239 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
240 Disclosure of auditors' remuneration [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAuditorsRemunerationExplanatory
241 015 - Disclosure - Note 10 - Staff Costs Network

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 http://www.rhythmone.com/20180331/role/statement-note-10-staff-costs
242 Statement Table [Table] Table

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 rhyth:StatementTable
243 Legal Entity [Axis] Axis dei:LegalEntityAxis
244 Entity [Domain] Member dei:EntityDomain
245 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
246 Disclosure of information about employees [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutEmployeesExplanatory
247 016 - Disclosure - Note 11 - Finance Income and Expense from Continuing Operations Network

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 http://www.rhythmone.com/20180331/role/statement-note-11-finance-income-and-expense-from-continuing-operations
248 Statement Table [Table] Table

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 rhyth:StatementTable
249 Legal Entity [Axis] Axis dei:LegalEntityAxis
250 Entity [Domain] Member dei:EntityDomain
251 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
252 Disclosure of finance income (cost) [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
253 017 - Disclosure - Note 12 - Income Tax Charge / (Credit) Network

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 http://www.rhythmone.com/20180331/role/statement-note-12-income-tax-charge-credit
254 Statement Table [Table] Table

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 rhyth:StatementTable
255 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
256 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
257 UNITED KINGDOM Member country:GB
258 UNITED STATES Member country:US
259 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
260 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
261 Changes in tax rates or tax laws enacted or announced [member] Member ifrs-full:ChangesInTaxRatesOrTaxLawsEnactedOrAnnouncedMember
262 Legal Entity [Axis] Axis dei:LegalEntityAxis
263 Entity [Domain] Member dei:EntityDomain
264 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
265 Disclosure of income tax [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
266 018 - Disclosure - Note 13 - Earnings Per Share Network

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 http://www.rhythmone.com/20180331/role/statement-note-13-earnings-per-share
267 Statement Table [Table] Table

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268 Legal Entity [Axis] Axis dei:LegalEntityAxis
269 Entity [Domain] Member dei:EntityDomain
270 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
271 Earnings per share [text block] Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
272 019 - Disclosure - Note 14 - Goodwill Network

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 http://www.rhythmone.com/20180331/role/statement-note-14-goodwill
273 Statement Table [Table] Table

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 rhyth:StatementTable
274 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
275 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
276 All cash-generating units [member] Member rhyth:AllCashgeneratingUnitsMember
277 RhythmOne [member] Member rhyth:RhythmoneMember
278 Perk, Inc. [member] Member rhyth:PerkIncMember
279 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
280 YuMe, Inc. [member] Member rhyth:YumeIncMember
281 All cash-generating units under a terminal growth rate [member] Member rhyth:AllCashgeneratingUnitsUnderATerminalGrowthRateMember
282 Range [axis] Axis ifrs-full:RangeAxis
283 Ranges [member] Member ifrs-full:RangesMember
284 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
285 Legal Entity [Axis] Axis dei:LegalEntityAxis
286 Entity [Domain] Member dei:EntityDomain
287 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
288 Disclosure of goodwill [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoodwillExplanatory
289 020 - Disclosure - Note 15 - Intangible Assets Network

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 http://www.rhythmone.com/20180331/role/statement-note-15-intangible-assets
290 Statement Table [Table] Table

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291 Legal Entity [Axis] Axis dei:LegalEntityAxis
292 Entity [Domain] Member dei:EntityDomain
293 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
294 Disclosure of intangible assets [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
295 021 - Disclosure - Note 16 - Property, Plant and Equipment Network

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 http://www.rhythmone.com/20180331/role/statement-note-16-property-plant-and-equipment
296 Statement Table [Table] Table

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 rhyth:StatementTable
297 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
298 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
299 Computer equipment under finance lease [member] Member rhyth:ComputerEquipmentUnderFinanceLeaseMember
300 Legal Entity [Axis] Axis dei:LegalEntityAxis
301 Entity [Domain] Member dei:EntityDomain
302 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
303 Disclosure of property, plant and equipment [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
304 022 - Disclosure - Note 17 - Subsidiaries Network

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305 Statement Table [Table] Table

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306 Legal Entity [Axis] Axis dei:LegalEntityAxis
307 Entity [Domain] Member dei:EntityDomain
308 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
309 Disclosure of subsidiaries [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
310 023 - Disclosure - Note 18 - Other Receivables and Restricted Cash Network

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311 Statement Table [Table] Table

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312 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
313 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
314 Trade receivables [member] Member ifrs-full:TradeReceivablesMember
315 Non-current assets represents deposits with financial institutions as a condition of certain property leases [member] Member rhyth:NoncurrentAssetsRepresentsDepositsWithFinancialInstitutionsAsAConditionOfCertainPropertyLeasesMember
316 Current assets represents cash collateral against the term loan [member] Member rhyth:CurrentAssetsRepresentsCashCollateralAgainstTheTermLoanMember
317 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
318 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
319 Financial assets past due but not impaired [member] Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
320 Financial assets impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
321 Legal Entity [Axis] Axis dei:LegalEntityAxis
322 Entity [Domain] Member dei:EntityDomain
323 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
324 Disclosure of trade and other receivables [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
325 024 - Disclosure - Note 19 - Marketable Securities Network

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326 Statement Table [Table] Table

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327 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
328 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
329 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
330 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
331 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
332 Financial assets impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
333 Legal Entity [Axis] Axis dei:LegalEntityAxis
334 Entity [Domain] Member dei:EntityDomain
335 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
336 Disclosure of marketable securities [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfMarketableSecuritiesTextBlock
337 025 - Disclosure - Note 20 - Deferred Tax Network

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338 Statement Table [Table] Table

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339 Range [axis] Axis ifrs-full:RangeAxis
340 Ranges [member] Member ifrs-full:RangesMember
341 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
342 Top of range [member] Member ifrs-full:TopOfRangeMember
343 Legal Entity [Axis] Axis dei:LegalEntityAxis
344 Entity [Domain] Member dei:EntityDomain
345 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
346 Disclosure of deferred taxes [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredTaxesExplanatory
347 026 - Disclosure - Note 21 - Other Payables and Provisions for Liabilities Network

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348 Statement Table [Table] Table

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349 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
350 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
351 Revolving loan from Silicon Valley Bank [member] Member rhyth:RevolvingLoanFromSiliconValleyBankMember
352 Subordinated Loan and Security Agreement from Silicon Valley Bank [member] Member rhyth:SubordinatedLoanAndSecurityAgreementFromSiliconValleyBankMember
353 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
354 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
355 Fixed interest rate [member] Member ifrs-full:FixedInterestRateMember
356 Range [axis] Axis ifrs-full:RangeAxis
357 Ranges [member] Member ifrs-full:RangesMember
358 Top of range [member] Member ifrs-full:TopOfRangeMember
359 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
360 Legal Entity [Axis] Axis dei:LegalEntityAxis
361 Entity [Domain] Member dei:EntityDomain
362 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
363 Disclosure of trade and other payables [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
364 027 - Disclosure - Note 22 - Share Capital Network

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365 Statement Table [Table] Table

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366 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
367 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
368 Original ordinary shares [member] Member rhyth:OriginalOrdinarySharesMember
369 Consolidated ordinary shares [member] Member rhyth:ConsolidatedOrdinarySharesMember
370 Ordinary shares issued for the exercise of employee share options [member] Member rhyth:OrdinarySharesIssuedForTheExerciseOfEmployeeShareOptionsMember
371 Ordinary shares issued related to restricted stock units [member] Member rhyth:OrdinarySharesIssuedRelatedToRestrictedStockUnitsMember
372 Range [axis] Axis ifrs-full:RangeAxis
373 Ranges [member] Member ifrs-full:RangesMember
374 Top of range [member] Member ifrs-full:TopOfRangeMember
375 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
376 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
377 YuMe, Inc. [member] Member rhyth:YumeIncMember
378 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
379 Perk, Inc. [member] Member rhyth:PerkIncMember
380 Legal Entity [Axis] Axis dei:LegalEntityAxis
381 Entity [Domain] Member dei:EntityDomain
382 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
383 Disclosure of issued capital [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIssuedCapitalExplanatory
384 028 - Disclosure - Note 23 - Capitalization and Capital Reduction Network

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385 Statement Table [Table] Table

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386 Legal Entity [Axis] Axis dei:LegalEntityAxis
387 Entity [Domain] Member dei:EntityDomain
388 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
389 Disclosure of objectives, policies and processes for managing capital [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
390 029 - Disclosure - Note 24 - Share Premium Account Network

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391 Statement Table [Table] Table

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392 Legal Entity [Axis] Axis dei:LegalEntityAxis
393 Entity [Domain] Member dei:EntityDomain
394 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
395 Disclosure of share premium account [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfSharePremiumAccountTextBlock
396 030 - Disclosure - Note 25 - Shares to be Issued and Merger Reserve Network

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397 Statement Table [Table] Table

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398 Legal Entity [Axis] Axis dei:LegalEntityAxis
399 Entity [Domain] Member dei:EntityDomain
400 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
401 Disclosure of shares to be issued and merger reserve [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfSharesToBeIssuedAndMergerReserveTextBlock
402 031 - Disclosure - Note 26 - Operating Lease Arrangements Network

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403 Statement Table [Table] Table

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404 Range [axis] Axis ifrs-full:RangeAxis
405 Ranges [member] Member ifrs-full:RangesMember
406 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
407 Top of range [member] Member ifrs-full:TopOfRangeMember
408 Legal Entity [Axis] Axis dei:LegalEntityAxis
409 Entity [Domain] Member dei:EntityDomain
410 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
411 Disclosure of finance lease and operating lease by lessee [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeExplanatory
412 032 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes Network

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413 Statement Table [Table] Table

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414 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
415 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
416 Restricted stock units [member] Member rhyth:RestrictedStockUnitsMember
417 Legal Entity [Axis] Axis dei:LegalEntityAxis
418 Entity [Domain] Member dei:EntityDomain
419 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
420 Disclosure of share-based payment arrangements [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
421 033 - Disclosure - Note 28 - Financial Instruments Network

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422 Statement Table [Table] Table

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423 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
424 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
425 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
426 Legal Entity [Axis] Axis dei:LegalEntityAxis
427 Entity [Domain] Member dei:EntityDomain
428 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
429 Disclosure of financial instruments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
430 034 - Disclosure - Note 29 - Exceptional Items From Continuing Operations Network

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431 Statement Table [Table] Table

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432 Legal Entity [Axis] Axis dei:LegalEntityAxis
433 Entity [Domain] Member dei:EntityDomain
434 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
435 Disclosure of exceptional items [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfExceptionalItemsTextBlock
436 035 - Document - Note 30 - Operating Expenses by Nature From Continuing Operations Network

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437 Statement Table [Table] Table

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438 Legal Entity [Axis] Axis dei:LegalEntityAxis
439 Entity [Domain] Member dei:EntityDomain
440 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
441 Disclosure of expenses by nature [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExpensesByNatureExplanatory
442 036 - Disclosure - Note 31 - Related Party Transactions Network

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443 Statement Table [Table] Table

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444 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
445 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
446 Non-executive directors [member] Member rhyth:NonexecutiveDirectorsMember
447 Director, Edward Hastings [member] Member rhyth:DirectorEdwardHastingsMember
448 Legal Entity [Axis] Axis dei:LegalEntityAxis
449 Entity [Domain] Member dei:EntityDomain
450 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
451 Disclosure of related party [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
452 037 - Disclosure - Note 32 - Events After The Balance Sheet Date Network

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453 Statement Table [Table] Table

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454 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
455 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
456 Employment agreement [member] Member rhyth:EmploymentAgreementMember
457 Major ordinary share transactions [member] Member ifrs-full:MajorOrdinaryShareTransactionsMember
458 Legal Entity [Axis] Axis dei:LegalEntityAxis
459 Entity [Domain] Member dei:EntityDomain
460 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
461 Disclosure of events after reporting period [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
462 038 - Disclosure - Significant Accounting Policies (Policies) Network

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463 Statement Table [Table] Table

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464 Legal Entity [Axis] Axis dei:LegalEntityAxis
465 Entity [Domain] Member dei:EntityDomain
466 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
467 Discloure of Significant Accounting Policies Abstract rhyth:DisclosureOfSignificantAccountingPoliciesAbstract
468 Description of accounting policy for the basis of accounting [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForTheBasisOfAccountingTextBlock
469 Description of accounting policy for going concern [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForGoingConcernTextBlock
470 Description of accounting policy for the basis of consolidation [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForTheBasisOfConsolidationTextBlock
471 Description of accounting policy for goodwill [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForGoodwillExplanatory
472 Description of accounting policy for recognition of revenue [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
473 Description of accounting policy for advertising revenue [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForAdvertisingRevenueTextBlock
474 Description of accounting policy for the share of advertising revenue [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForTheShareOfAdvertisingRevenueTextBlock
475 Description of accounting policy for finance income and costs [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory
476 Description of accounting policy for expenses [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForExpensesExplanatory
477 Description of accounting policy for exceptional items [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForExceptionalItemsExplanatory
478 Description of accounting policy for termination benefits [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForTerminationBenefits
479 Description of accounting policy for leases [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
480 Description of accounting policy for foreign currency translation [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
481 Description of accounting policy for discontinued operations [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDiscontinuedOperationsExplanatory
482 Description of accounting policy for income tax [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
483 Description of accounting policy for trade and other receivables [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory
484 Description of accounting policy for property, plant and equipment [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
485 Description of accounting policy for intangible assets other than goodwill [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
486 Description of accounting policy for other intangible assets other than goodwill [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForOtherIntangibleAssetsOtherThanGoodwillTextBlock
487 Description of accounting policy for impairment of assets [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory
488 Description of accounting policy for trade and other payables [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory
489 Description of accounting policy for provisions [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
490 Description of accounting policy for share-based payment transactions [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
491 Description of accounting policy for borrowings [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForBorrowingsExplanatory
492 Description of accounting policy for employee benefits [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
493 Description of accounting policy for financial instruments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
494 Description of accounting policy for loans and receivables [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLoansAndReceivablesExplanatory
495 Description of accounting policy for restricted cash and cash equivalents [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRestrictedCashAndCashEquivalentsExplanatory
496 Description of accounting policy for impairment of financial assets [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory
497 Description of accounting policy for determining components of cash and cash equivalents [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
498 Description of accounting policy for financial instruments at fair value through profit or loss [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory
499 Description of accounting policy for financial liabilities and equity [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForFinancialLiabilitiesAndEquityTextBlock
500 Description of accounting policy for equity instruments [text block] Concept (Text Block (HTML)) For Period rhyth:DescriptionOfAccountingPolicyForEquityInstrumentsTextBlock
501 Description of accounting policy for financial liabilities [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory
502 Description of accounting policy for derivative financial instruments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory
503 Description of accounting policy for segment reporting [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
504 Description of accounting policy for business combinations [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory
505 039 - Disclosure - Note 3 - Significant Accounting Policies (Tables) Network

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506 Statement Table [Table] Table

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507 Legal Entity [Axis] Axis dei:LegalEntityAxis
508 Entity [Domain] Member dei:EntityDomain
509 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
510 Disclosure of property, plant and equipment useful life [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfPropertyPlantAndEquipmentUsefulLifeTextBlock
511 Disclosure of intangible assets material to entity [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsMaterialToEntityExplanatory
512 040 - Disclosure - Note 5 - Segment Analysis (Tables) Network

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513 Statement Table [Table] Table

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514 Legal Entity [Axis] Axis dei:LegalEntityAxis
515 Entity [Domain] Member dei:EntityDomain
516 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
517 Disclosure of disaggregation of revenue from contracts with customers [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory
518 041 - Disclosure - Note 6 - Discontinued Operations (Tables) Network

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519 Statement Table [Table] Table

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520 Legal Entity [Axis] Axis dei:LegalEntityAxis
521 Entity [Domain] Member dei:EntityDomain
522 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
523 Disclosure of detailed information about discontinued operations [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationAboutDiscontinuedOperationsTextBlock
524 042 - Disclosure - Note 7 - Business Combinations (Tables) Network

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525 Statement Table [Table] Table

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526 Legal Entity [Axis] Axis dei:LegalEntityAxis
527 Entity [Domain] Member dei:EntityDomain
528 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
529 Disclosure of detailed information about business combinations [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory
530 043 - Disclosure - Note 8 - Loss For The Year (Tables) Network

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531 Statement Table [Table] Table

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532 Legal Entity [Axis] Axis dei:LegalEntityAxis
533 Entity [Domain] Member dei:EntityDomain
534 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
535 Disclosure of detailed information about profit (loss) from operating activities [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationAboutProfitLossFromOperatingActivitiesTextBlock
536 044 - Disclosure - Note 9 - Auditor's Renumeration (Tables) Network

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537 Statement Table [Table] Table

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538 Legal Entity [Axis] Axis dei:LegalEntityAxis
539 Entity [Domain] Member dei:EntityDomain
540 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
541 Disclosure of detailed information about auditors' remuneration [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationAboutAuditorsRemunerationTextBlock
542 045 - Disclosure - Note 10 - Staff Costs (Tables) Network

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543 Statement Table [Table] Table

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544 Legal Entity [Axis] Axis dei:LegalEntityAxis
545 Entity [Domain] Member dei:EntityDomain
546 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
547 Disclosure of sales, marketing, research, development, administration and operations expense [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfSalesMarketingResearchDevelopmentAdministrationAndOperationsExpenseTextBlock
548 Disclosure of employee benefits [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
549 046 - Disclosure - Note 11 - Finance Income and Expense from Continuing Operations (Tables) Network

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550 Statement Table [Table] Table

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551 Legal Entity [Axis] Axis dei:LegalEntityAxis
552 Entity [Domain] Member dei:EntityDomain
553 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
554 Disclosure of detailed information finance income (cost) [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationFinanceIncomeCostTextBlock
555 047 - Disclosure - Note 12 - Income Tax Charge / (Credit) (Tables) Network

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556 Statement Table [Table] Table

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557 Legal Entity [Axis] Axis dei:LegalEntityAxis
558 Entity [Domain] Member dei:EntityDomain
559 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
560 Disclosure of detailed information about income tax [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationAboutIncomeTaxTextBlock
561 Disclosure of components of tax credit [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfComponentsOfTaxCreditTextBlock
562 048 - Disclosure - Note 13 - Earnings Per Share (Tables) Network

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563 Statement Table [Table] Table

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564 Legal Entity [Axis] Axis dei:LegalEntityAxis
565 Entity [Domain] Member dei:EntityDomain
566 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
567 Disclosure of earnings per share [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
568 049 - Disclosure - Note 14 - Goodwill (Tables) Network

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569 Statement Table [Table] Table

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570 Legal Entity [Axis] Axis dei:LegalEntityAxis
571 Entity [Domain] Member dei:EntityDomain
572 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
573 Disclosure of reconciliation of changes in goodwill [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillExplanatory
574 050 - Disclosure - Note 15 - Intangible Assets (Tables) Network

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575 Statement Table [Table] Table

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576 Legal Entity [Axis] Axis dei:LegalEntityAxis
577 Entity [Domain] Member dei:EntityDomain
578 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
579 Disclosure of detailed information about intangible assets [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
580 051 - Disclosure - Note 16 - Property, Plant and Equipment (Tables) Network

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581 Statement Table [Table] Table

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582 Legal Entity [Axis] Axis dei:LegalEntityAxis
583 Entity [Domain] Member dei:EntityDomain
584 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
585 Disclosure of detailed information about property, plant and equipment [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
586 052 - Disclosure - Note 17 - Subsidiaries (Tables) Network

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587 Statement Table [Table] Table

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588 Legal Entity [Axis] Axis dei:LegalEntityAxis
589 Entity [Domain] Member dei:EntityDomain
590 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
591 Disclosure of interests in subsidiaries [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory
592 053 - Disclosure - Note 18 - Other Receivables and Restricted Cash (Tables) Network

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593 Statement Table [Table] Table

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594 Legal Entity [Axis] Axis dei:LegalEntityAxis
595 Entity [Domain] Member dei:EntityDomain
596 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
597 Disclosure of components of other receivables and restricted cash [text bloxk] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfComponentsOfOtherReceivablesAndRestrictedCashTextBloxk
598 Disclosure of allowance for credit losses [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAllowanceForCreditLossesExplanatory
599 Disclosure of financial assets that are either past due or impaired [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory
600 054 - Disclosure - Note 19 - Marketable Securities (Tables) Network

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601 Statement Table [Table] Table

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602 Legal Entity [Axis] Axis dei:LegalEntityAxis
603 Entity [Domain] Member dei:EntityDomain
604 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
605 Disclosure of transfers of financial assets [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransfersOfFinancialAssetsExplanatory
606 Disclosure of components of marketable securities [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfComponentsOfMarketableSecuritiesTextBlock
607 055 - Disclosure - Note 20 - Deferred Tax (Tables) Network

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608 Statement Table [Table] Table

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609 Legal Entity [Axis] Axis dei:LegalEntityAxis
610 Entity [Domain] Member dei:EntityDomain
611 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
612 Disclosure of temporary difference, unused tax losses and unused tax credits [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
613 056 - Disclosure - Note 21 - Other Payables and Provisions for Liabilities (Tables) Network

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614 Statement Table [Table] Table

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615 Legal Entity [Axis] Axis dei:LegalEntityAxis
616 Entity [Domain] Member dei:EntityDomain
617 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
618 Disclosure of detailed information about trade and other payables [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationAboutTradeAndOtherPayablesTextBlock
619 Disclosure of other provisions [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
620 Disclosure of maturity analysis for non-derivative financial liabilities [text block] Concept (Text Block (HTML)) For Period ifrs-full:MaturityAnalysisForNonderivativeFinancialLiabilities
621 057 - Disclosure - Note 22 - Share Capital (Tables) Network

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622 Statement Table [Table] Table

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623 Legal Entity [Axis] Axis dei:LegalEntityAxis
624 Entity [Domain] Member dei:EntityDomain
625 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
626 Disclosure of classes of share capital [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
627 058 - Disclosure - Note 24 - Share Premium Account (Tables) Network

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628 Statement Table [Table] Table

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629 Legal Entity [Axis] Axis dei:LegalEntityAxis
630 Entity [Domain] Member dei:EntityDomain
631 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
632 Disclosure of detailed information about share premium [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationAboutSharePremiumTextBlock
633 059 - Disclosure - Note 26 - Operating Lease Arrangements (Tables) Network

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634 Statement Table [Table] Table

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635 Legal Entity [Axis] Axis dei:LegalEntityAxis
636 Entity [Domain] Member dei:EntityDomain
637 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
638 Disclosure of finance lease and operating lease by lessee components [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeComponentsTextBlock
639 060 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes (Tables) Network

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640 Statement Table [Table] Table

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 rhyth:StatementTable
641 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
642 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
643 The RhythmOne EMI scheme and the RhythmOne US plan [member] Member rhyth:TheRhythmoneEmiSchemeAndTheRhythmoneUsPlanMember
644 Legal Entity [Axis] Axis dei:LegalEntityAxis
645 Entity [Domain] Member dei:EntityDomain
646 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
647 Disclosure of share-based compensation charges [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfSharebasedCompensationChargesTextBlock
648 Disclosure of number and weighted average exercise prices of share options [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
649 Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory
650 Disclosure of number and weighted average exercise prices of other equity instruments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory
651 061 - Disclosure - Note 28 - Financial Instruments (Tables) Network

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652 Statement Table [Table] Table

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653 Legal Entity [Axis] Axis dei:LegalEntityAxis
654 Entity [Domain] Member dei:EntityDomain
655 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
656 Disclosure of detailed information about financial instruments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory
657 Disclosure of currency risk [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfCurrencyRiskTextBlock
658 062 - Disclosure - Note 29 - Exceptional Items From Continuing Operations (Tables) Network

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659 Statement Table [Table] Table

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 rhyth:StatementTable
660 Legal Entity [Axis] Axis dei:LegalEntityAxis
661 Entity [Domain] Member dei:EntityDomain
662 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
663 Disclosure of detailed information relating to exceptional items [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationRelatingToExceptionalItemsTextBlock
664 063 - Disclosure - Note 30 - Operating Expenses by Nature From Continuing Operations (Tables) Network

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665 Statement Table [Table] Table

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 rhyth:StatementTable
666 Legal Entity [Axis] Axis dei:LegalEntityAxis
667 Entity [Domain] Member dei:EntityDomain
668 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
669 Disclosure of detailed information relating to operating expenses [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfDetailedInformationRelatingToOperatingExpensesTextBlock
670 064 - Disclosure - Note 31 - Related Party Transactions (Tables) Network

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671 Statement Table [Table] Table

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672 Legal Entity [Axis] Axis dei:LegalEntityAxis
673 Entity [Domain] Member dei:EntityDomain
674 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
675 Disclosure of transactions between related parties [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
676 Disclosure of options and other equity instruments for related parties [text block] Concept (Text Block (HTML)) For Period rhyth:DisclosureOfOptionsAndOtherEquityInstrumentsForRelatedPartiesTextBlock
677 065 - Disclosure - Note 3 - Significant Accounting Policies (Details Textual) Network

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678 Statement Table [Table] Table

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 rhyth:StatementTable
679 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
680 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
681 Capitalised development expenditure [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
682 Legal Entity [Axis] Axis dei:LegalEntityAxis
683 Entity [Domain] Member dei:EntityDomain
684 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
685 Useful lives or amortisation rates, intangible assets other than goodwill Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
686 Intangible assets under development Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsUnderDevelopment
687 066 - Disclosure - Note 3 - Significant Accounting Policies - Property, Plant and Equipment Useful Life (Details) Network

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688 Statement Table [Table] Table

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 rhyth:StatementTable
689 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
690 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
691 Fixtures, fittings, office and computer equipment [member] Member rhyth:FixturesFittingsOfficeAndComputerEquipmentMember
692 Leasehold improvements [member] Member ifrs-full:LeaseholdImprovementsMember
693 Legal Entity [Axis] Axis dei:LegalEntityAxis
694 Entity [Domain] Member dei:EntityDomain
695 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
696 Useful life Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
697 067 - Disclosure - Note 3 - Significant Accounting Policies - Other Intangible Assets Excluding Goodwill (Details) Network

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698 Statement Table [Table] Table

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 rhyth:StatementTable
699 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
700 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
701 Tradenames, patents and trademarks [member] Member rhyth:TradenamesPatentsAndTrademarksMember
702 Computer software [member] Member ifrs-full:ComputerSoftwareMember
703 Technology-based intangible assets [member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
704 Customer-related intangible assets [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
705 Favorable leases [member] Member rhyth:FavorableLeasesMember
706 Legal Entity [Axis] Axis dei:LegalEntityAxis
707 Entity [Domain] Member dei:EntityDomain
708 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
709 Other Intangible Assets Excluding Goodwill, Useful Life Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
710 068 - Disclosure - Note 4 - Critical Judgements and Key Sources of Estimation Uncertainty (Details Textual) Network

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711 Statement Table [Table] Table

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 rhyth:StatementTable
712 Legal Entity [Axis] Axis dei:LegalEntityAxis
713 Entity [Domain] Member dei:EntityDomain
714 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
715 Goodwill at end of period Concept (Monetary) As Of Debit ifrs-full:Goodwill
716 069 - Disclosure - Note 5 - Segment Analysis (Details Textual) Network

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717 Statement Table [Table] Table

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 rhyth:StatementTable
718 Legal Entity [Axis] Axis dei:LegalEntityAxis
719 Entity [Domain] Member dei:EntityDomain
720 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
721 Number of major customers Concept (Decimal) As Of rhyth:NumberOfMajorCustomers
722 Percentage of entity's revenue Concept (Percent) For Period ifrs-full:PercentageOfEntitysRevenue
723 070 - Disclosure - Note 5 - Segment Analysis - Revenue (Details) Network

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724 Statement Table [Table] Table

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725 Legal Entity [Axis] Axis dei:LegalEntityAxis
726 Entity [Domain] Member dei:EntityDomain
727 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
728 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
729 071 - Disclosure - Note 6 - Discontinued Operations (Details Textual) Network

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730 Statement Table [Table] Table

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 rhyth:StatementTable
731 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
732 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
733 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
734 Legal Entity [Axis] Axis dei:LegalEntityAxis
735 Entity [Domain] Member dei:EntityDomain
736 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
737 Annual installment payyments Concept (Monetary) As Of Credit rhyth:AnnualInstallmentPayyments
738 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
739 Proceeds from borrowings, classified as financing activities Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
740 Borrowings to be collected Concept (Monetary) As Of Debit rhyth:BorrowingsToBeCollected
741 072 - Disclosure - Note 6 - Discontinued Operations - Summary of Discontinued Operations (Details) Network

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742 Statement Table [Table] Table

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 rhyth:StatementTable
743 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
744 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
745 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
746 Legal Entity [Axis] Axis dei:LegalEntityAxis
747 Entity [Domain] Member dei:EntityDomain
748 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
749 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
750 Cost of revenue Concept (Monetary) For Period Debit ifrs-full:CostOfSales
751 Operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpenseExcludingCostOfSales
752 Loss before tax and loss on other items Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
753 Finance expense Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
754 Loss on disposition of assets Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfNoncurrentAssets
755 Loss before income taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
756 Total tax expense (income) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
757 Loss from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
758 BASIC (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShareFromDiscontinuedOperations
759 DILUTED (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShareFromDiscontinuedOperations
760 Net cash from (used in) operating activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations
761 Net cash from (used in) investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations
762 Net cash used in financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations
763 Net cash used in discontinued operations Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsDiscontinuedOperations
764 Cash consideration received Concept (Monetary) For Period Credit ifrs-full:ConsiderationPaidReceived
765 Deferred sales proceeds(a) Concept (Monetary) For Period Debit rhyth:DeferredSalesProceeds
766 Total Consideration Received Concept (Monetary) As Of Debit rhyth:ConsiderationReceivedIncludingDeferredConsideration
767 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:Prepayments
768 Property, plant and equipment at end of period Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
769 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
770 Goodwill at end of period Concept (Monetary) As Of Debit ifrs-full:Goodwill
771 Total Assets Disposed Of Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
772 Transaction costs Concept (Monetary) For Period Debit ifrs-full:ExpensesDiscontinuedOperations
773 Net assets of PVMG disposed of Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
774 Net Cash Inflow on Disposition Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
775 073 - Disclosure - Note 7 - Business Combinations (Details Textual) Network

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776 Statement Table [Table] Table

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 rhyth:StatementTable
777 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
778 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
779 Perk, Inc. [member] Member rhyth:PerkIncMember
780 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
781 YuMe, Inc. [member] Member rhyth:YumeIncMember
782 Legal Entity [Axis] Axis dei:LegalEntityAxis
783 Entity [Domain] Member dei:EntityDomain
784 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
785 Percentage of voting equity interests acquired Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
786 Total consideration transferred, acquisition-date fair value Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
787 Number of instruments or interests issued or issuable Concept (Decimal) As Of ifrs-full:NumberOfInstrumentsOrInterestsIssuedOrIssuable
788 Equity interests of acquirer Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
789 Amounts recognised for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination Concept (Monetary) For Period ifrs-full:AmountsRecognisedForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
790 Revenue of acquiree since acquisition date Concept (Monetary) For Period Credit ifrs-full:RevenueOfAcquiree
791 Profit (loss) of acquiree since acquisition date Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfAcquiree
792 Revenue of combined entity as if combination occurred at beginning of period Concept (Monetary) For Period Credit ifrs-full:RevenueOfCombinedEntity
793 Profit (loss) of combined entity as if combination occurred at beginning of period Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfCombinedEntity
794 Fair value of acquired receivables Concept (Monetary) As Of Debit ifrs-full:FairValueOfAcquiredReceivables
795 Gross contractual amounts receivable for acquired receivables Concept (Monetary) As Of Debit ifrs-full:GrossContractualAmountsReceivableForAcquiredReceivables
796 Best estimate at acquisition date of contractual cash flows not expected to be collected for acquired receivables Concept (Monetary) As Of Debit ifrs-full:BestEstimateAtAcquisitionDateOfContractualCashFlowsNotExpectedToBeCollectedForAcquiredReceivables
797 Goodwill at end of period Concept (Monetary) As Of Debit ifrs-full:Goodwill
798 Goodwill expected to be deductible for tax purposes Concept (Monetary) As Of Debit ifrs-full:GoodwillExpectedDeductibleForTaxPurposes
799 Cash transferred Concept (Monetary) As Of Credit ifrs-full:CashTransferred
800 Liabilities incurred Concept (Monetary) As Of Credit ifrs-full:LiabilitiesIncurred
801 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
802 Settled liabilities, contingent liabilities recognised in business combination Concept (Monetary) For Period Debit ifrs-full:SettledLiabilitiesContingentLiabilitiesRecognisedInBusinessCombination
803 Useful lives or amortisation rates, intangible assets other than goodwill Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
804 074 - Disclosure - Note 7 - Business Combinations - Components of Business Combinations (Details) Network

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805 Statement Table [Table] Table

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 rhyth:StatementTable
806 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
807 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
808 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
809 YuMe, Inc. [member] Member rhyth:YumeIncMember
810 Perk, Inc. [member] Member rhyth:PerkIncMember
811 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
812 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
813 Tradename [member] Member rhyth:TradenameMember
814 Computer software [member] Member ifrs-full:ComputerSoftwareMember
815 Customer-related intangible assets [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
816 Favorable leases [member] Member rhyth:FavorableLeasesMember
817 Trade names and trademarks [member] Member rhyth:TradeNamesAndTrademarksMember
818 Technology-based intangible assets [member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
819 Legal Entity [Axis] Axis dei:LegalEntityAxis
820 Entity [Domain] Member dei:EntityDomain
821 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
822 Total consideration transferred, acquisition-date fair value Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
823 Cash Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
824 Fair value of acquired receivables Concept (Monetary) As Of Debit ifrs-full:FairValueOfAcquiredReceivables
825 Other receivables Concept (Monetary) As Of Debit rhyth:OtherReceivablesRecognisedAsOfAcquisitionDate
826 Property plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
827 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
828 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesRecognisedAsOfAcquisitionDate
829 Term loans Concept (Monetary) As Of Credit rhyth:CurrentTermLoansRecognisedAsOfAcquisitionDate
830 Provisions Concept (Monetary) As Of Credit rhyth:CurrentProvisionsRecognisedAsOfAcquisitionDate
831 Income tax payable Concept (Monetary) As Of Credit rhyth:CurrentIncomeTaxPayableRecognisedAsOfAcquisitionDate
832 Term loans Concept (Monetary) As Of Credit rhyth:NoncurrentTermLoansRecognisedAsOfAcquisitionDate
833 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
834 FAIR VALUE OF NET IDENTIFIABLE ASSETS AND LIABILITIES ASSUMED Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
835 Goodwill at end of period Concept (Monetary) As Of Debit ifrs-full:Goodwill
836 Other assets Concept (Monetary) As Of Debit rhyth:OtherAssetsRecognisedAsOfAcquisitionDate
837 Credit facility Concept (Monetary) As Of Credit ifrs-full:BorrowingsRecognisedAsOfAcquisitionDate
838 Provisional fair value of net identifiable assets and liabilities assumed Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
839 Cash transferred Concept (Monetary) As Of Credit ifrs-full:CashTransferred
840 Liabilities incurred Concept (Monetary) As Of Credit ifrs-full:LiabilitiesIncurred
841 Total net cash outflow arising on acquisition Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
842 Equity interests of acquirer Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
843 075 - Disclosure - Note 7 - Business Combinations - Components of Business Combinations (Details) (Parentheticals) Network

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844 Statement Table [Table] Table

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845 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
846 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
847 Perk, Inc. [member] Member rhyth:PerkIncMember
848 Legal Entity [Axis] Axis dei:LegalEntityAxis
849 Entity [Domain] Member dei:EntityDomain
850 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
851 Number of instruments or interests issued or issuable Concept (Decimal) As Of ifrs-full:NumberOfInstrumentsOrInterestsIssuedOrIssuable
852 076 - Disclosure - Note 8 - Loss For The Year (Details Textual) Network

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853 Statement Table [Table] Table

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854 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
855 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
856 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
857 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
858 Legal Entity [Axis] Axis dei:LegalEntityAxis
859 Entity [Domain] Member dei:EntityDomain
860 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
861 Exceptional costs Concept (Monetary) For Period Debit rhyth:ExceptionalCosts
862 077 - Disclosure - Note 8 - Loss for the Year - Components of Loss for the Year (Details) Network

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863 Statement Table [Table] Table

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 rhyth:StatementTable
864 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
865 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
866 Property, plant and equipment owned [member] Member rhyth:PropertyPlantAndEquipmentOwnedMember
867 Property, plant and equipment leased [member] Member rhyth:PropertyPlantAndEquipmentLeasedMember
868 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
869 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
870 Customer-related intangible assets [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
871 Technology-based intangible assets [member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
872 Capitalised development expenditure [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
873 Tradenames, patents and trademarks [member] Member rhyth:TradenamesPatentsAndTrademarksMember
874 Computer software [member] Member ifrs-full:ComputerSoftwareMember
875 Other intangible assets [member] Member ifrs-full:OtherIntangibleAssetsMember
876 Legal Entity [Axis] Axis dei:LegalEntityAxis
877 Entity [Domain] Member dei:EntityDomain
878 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
879 Net foreign exchange (gains) / losses Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
880 Operating lease payments (see note 26) Concept (Monetary) For Period Debit ifrs-full:LeaseAndSubleasePaymentsRecognisedAsExpense
881 Research and development costs (excluding amortization and depreciation) Concept (Monetary) For Period Debit rhyth:ResearchAndDevelopmentCostsExcludingAmortizationAndDepreciation
882 Depreciation of property, plant and equipment Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
883 Amortization of intangibles Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
884 Loss on disposal of property and equipment Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
885 Acquisition and exceptional costs (see note 29) (a) Concept (Monetary) For Period Debit rhyth:AcquisitionAndExceptionalCosts
886 Staff costs (see note 10) Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
887 Impairment loss recognized on trade receivables (see note 18) Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLossTradeReceivables
888 078 - Disclosure - Note 9 - Auditor's Remuneration - Components of Auditor's Remuneration (Details) Network

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889 Statement Table [Table] Table

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 rhyth:StatementTable
890 Legal Entity [Axis] Axis dei:LegalEntityAxis
891 Entity [Domain] Member dei:EntityDomain
892 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
893 Fees payable to the Company’s auditors for the audit of the Parent Company and Consolidated annual financial statements Concept (Monetary) For Period Debit ifrs-full:AuditorsRemunerationForAuditServices
894 Audit related assurance services Concept (Monetary) For Period Debit rhyth:AuditorsRemunerationForAuditRelatedAssuranceServices
895 Tax advisory services Concept (Monetary) For Period Debit ifrs-full:AuditorsRemunerationForTaxServices
896 Other assurance services Concept (Monetary) For Period Debit rhyth:AuditorsRemunerationForOtherAssuranceServices
897 Other non-audit services Concept (Monetary) For Period Debit rhyth:AuditorsRemunerationForOtherNonauditServices
898 Transaction related services Concept (Monetary) For Period Debit rhyth:AuditorsRemunerationForTransactionRelatedServices
899 Total Fees Concept (Monetary) For Period Debit ifrs-full:AuditorsRemuneration
900 079 - Disclosure - Note 10 - Staff Costs - Sales, Marketing, Research, Development, Administration and Operations Expense (Details) Network

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901 Statement Table [Table] Table

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 rhyth:StatementTable
902 Legal Entity [Axis] Axis dei:LegalEntityAxis
903 Entity [Domain] Member dei:EntityDomain
904 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
905 Sales and marketing Concept (Monetary) For Period Debit ifrs-full:SalesAndMarketingExpense
906 Research and development Concept (Monetary) For Period Debit ifrs-full:ResearchAndDevelopmentExpense
907 Administration and operations Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
908 TOTAL Concept (Monetary) For Period Debit rhyth:SalesMarketingResearchDevelopmentAdministrationAndOperationsExpense
909 080 - Disclosure - Note 10 - Staff Costs - Components of Staff Costs (Details) Network

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910 Statement Table [Table] Table

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 rhyth:StatementTable
911 Legal Entity [Axis] Axis dei:LegalEntityAxis
912 Entity [Domain] Member dei:EntityDomain
913 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
914 Wages and salaries Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
915 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
916 Social Security costs Concept (Monetary) For Period Debit ifrs-full:SocialSecurityContributions
917 Other pension costs Concept (Monetary) For Period Debit ifrs-full:OtherShorttermEmployeeBenefits
918 Staff Costs - Direct Concept (Monetary) For Period Debit ifrs-full:ShorttermEmployeeBenefitsExpense
919 Other employee benefits and costs Concept (Monetary) For Period Debit ifrs-full:OtherEmployeeExpense
920 Costs allocated to internally-generated assets Concept (Monetary) For Period Debit rhyth:CostsAllocatedToInternallygeneratedAssets
921 Staff costs (see note 10) Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
922 081 - Disclosure - Note 11 - Finance Income and Expense from Continuing Operations - Components of Finance Income (Cost) (Details) Network

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923 Statement Table [Table] Table

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 rhyth:StatementTable
924 Legal Entity [Axis] Axis dei:LegalEntityAxis
925 Entity [Domain] Member dei:EntityDomain
926 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
927 Interest income on cash and cash equivalents Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnCashAndCashEquivalents
928 Interest expense on credit facility and term loan Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBorrowings
929 Interest expense on obligations under finance leases Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnFinanceLeases
930 TOTAL (EXPENSE) / INCOME Concept (Monetary) For Period Credit ifrs-full:FinanceIncomeCost
931 082 - Disclosure - Note 12 - Income Tax Charge / (Credit) (Details Textual) Network

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932 Statement Table [Table] Table

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 rhyth:StatementTable
933 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
934 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
935 UNITED KINGDOM Member country:GB
936 UNITED STATES Member country:US
937 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
938 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
939 Changes in tax rates or tax laws enacted or announced [member] Member ifrs-full:ChangesInTaxRatesOrTaxLawsEnactedOrAnnouncedMember
940 Legal Entity [Axis] Axis dei:LegalEntityAxis
941 Entity [Domain] Member dei:EntityDomain
942 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
943 Applicable tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
944 Total tax expense (income) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
945 Tax effect from change in tax rate Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
946 Other tax effects for reconciliation between accounting profit and tax expense (income) Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
947 Total increase (decrease) in deferred tax liability (asset) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInDeferredTaxLiabilityAsset
948 083 - Disclosure - Note 12 - Income Tax Charge / (Credit) - Components of Income Tax (Details) Network

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949 Statement Table [Table] Table

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 rhyth:StatementTable
950 Legal Entity [Axis] Axis dei:LegalEntityAxis
951 Entity [Domain] Member dei:EntityDomain
952 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
953 Current tax Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
954 Deferred tax Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
955 TAX CREDIT Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
956 084 - Disclosure - Note 12 - Income Tax Charge / (Credit) - Components of Tax Credit (Details) Network

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957 Statement Table [Table] Table

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 rhyth:StatementTable
958 Legal Entity [Axis] Axis dei:LegalEntityAxis
959 Entity [Domain] Member dei:EntityDomain
960 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
961 Loss before tax Concept (Monetary) For Period Credit ifrs-full:AccountingProfit
962 Tax at UK corporation rate of 19% (2017: 20%) Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
963 Adjustment for overseas tax rate Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
964 Tax effect of expense not deductible in determining taxable profit / (loss) Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
965 Recognition of previously unrecognized deferred tax asset Concept (Monetary) For Period Debit rhyth:TaxEffectFromChangeFromRecognitionOfPreviouslyUnrecognizedDeferredTaxAsset
966 Deferred tax not recognized Concept (Monetary) For Period Debit rhyth:TaxEffectOfImpairmentOfDeferredTaxNotRecognized
967 Reduced tax in subsidiaries operating in other jurisdictions Concept (Monetary) For Period Debit rhyth:TaxEffectOfImpairmentOfReducedTaxInSubsidiariesOperatingInOtherJurisdictions
968 Impact of share-based payments Concept (Monetary) For Period Debit rhyth:TaxRateEffectOfSharebasedPayments
969 Adjustment in respect to prior years Concept (Monetary) For Period Debit rhyth:TaxRateEffectOfAdjustmentForCurrentTaxOfPriorPeriods
970 Non-deductible impairment expense Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfImpairmentOfGoodwill
971 Tax reform – Tax rate change Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
972 Tax reform – Section 965 transition tax Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
973 TAX CREDIT Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
974 085 - Disclosure - Note 12 - Income Tax Charge / (Credit) - Components of Tax Credit (Details) (Parentheticals) Network

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975 Statement Table [Table] Table

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 rhyth:StatementTable
976 Legal Entity [Axis] Axis dei:LegalEntityAxis
977 Entity [Domain] Member dei:EntityDomain
978 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
979 Applicable tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
980 086 - Disclosure - Note 13 - Earnings Per Share (Details Textual) Network

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981 Statement Table [Table] Table

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 rhyth:StatementTable
982 Legal Entity [Axis] Axis dei:LegalEntityAxis
983 Entity [Domain] Member dei:EntityDomain
984 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
985 Number of ordinary shares issued for ten former shares Concept (Shares) For Period rhyth:NumberOfOrdinarySharesIssuedForTenFormerShares
986 087 - Disclosure - Note 13 - Earnings Per Share - Components of Earnings Per Shares (Details) Network

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987 Statement Table [Table] Table

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 rhyth:StatementTable
988 Legal Entity [Axis] Axis dei:LegalEntityAxis
989 Entity [Domain] Member dei:EntityDomain
990 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
991 Loss used in calculation of basic and diluted earnings per share Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
992 Loss used in calculation of basic and diluted earnings per share from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
993 Weighted average number of shares for the purpose of basic earnings per share (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
994 Weighted average number of shares for the purpose of diluted earnings per share (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
995 088 - Disclosure - Note 14 - Goodwill (Details Textual) Network

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996 Statement Table [Table] Table

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 rhyth:StatementTable
997 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
998 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
999 All cash-generating units [member] Member rhyth:AllCashgeneratingUnitsMember
1000 RhythmOne [member] Member rhyth:RhythmoneMember
1001 Perk, Inc. [member] Member rhyth:PerkIncMember
1002 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
1003 YuMe, Inc. [member] Member rhyth:YumeIncMember
1004 All cash-generating units under a terminal growth rate [member] Member rhyth:AllCashgeneratingUnitsUnderATerminalGrowthRateMember
1005 Range [axis] Axis ifrs-full:RangeAxis
1006 Ranges [member] Member ifrs-full:RangesMember
1007 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1008 Legal Entity [Axis] Axis dei:LegalEntityAxis
1009 Entity [Domain] Member dei:EntityDomain
1010 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1011 Explanation of period over which management has projected cash flows Concept (Text/String) For Period ifrs-full:ExplanationOfPeriodOverWhichManagementHasProjectedCashFlows
1012 Growth rate used to extrapolate cash flow projections Concept (Percent) As Of ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
1013 Average reduction rate, year one Concept (Percent) As Of rhyth:AverageReductionRateYearOne
1014 Discount rate applied to cash flow projections Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1015 Recoverable amount of asset or cash-generating unit Concept (Monetary) As Of Debit ifrs-full:RecoverableAmountOfAssetOrCashgeneratingUnit
1016 089 - Disclosure - Note 14 - Goodwill - Reconciliation of Goodwill (Details) Network

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1017 Statement Table [Table] Table

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 rhyth:StatementTable
1018 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
1019 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
1020 RhythmOne [member] Member rhyth:RhythmoneMember
1021 AdKarma [member] Member rhyth:AdkarmaMember
1022 Perk, Inc. [member] Member rhyth:PerkIncMember
1023 Prime Visibility Media Group [member] Member rhyth:PrimeVisibilityMediaGroupMember
1024 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
1025 YuMe, Inc. [member] Member rhyth:YumeIncMember
1026 Legal Entity [Axis] Axis dei:LegalEntityAxis
1027 Entity [Domain] Member dei:EntityDomain
1028 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1029 Balance Concept (Monetary) As Of Debit ifrs-full:Goodwill
1030 Acquisition and disposal adjustments Concept (Monetary) For Period Debit rhyth:GoodwillAcquisitionAndDisposalAdjustments
1031 Reclassification Concept (Monetary) For Period Debit rhyth:GoodwillReclassification
1032 Balance Concept (Monetary) As Of Debit ifrs-full:Goodwill
1033 090 - Disclosure - Note 15 - Intangible Assets - Components of Intangible Assets (Details) Network

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1034 Statement Table [Table] Table

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 rhyth:StatementTable
1035 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1036 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1037 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1038 Accumulated depreciation and amortisation [member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
1039 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
1040 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
1041 Customer-related intangible assets [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
1042 Technology-based intangible assets [member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
1043 Capitalised development expenditure [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
1044 Tradenames, patents and trademarks [member] Member rhyth:TradenamesPatentsAndTrademarksMember
1045 Computer software [member] Member ifrs-full:ComputerSoftwareMember
1046 Other intangible assets [member] Member ifrs-full:OtherIntangibleAssetsMember
1047 Legal Entity [Axis] Axis dei:LegalEntityAxis
1048 Entity [Domain] Member dei:EntityDomain
1049 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1050 Balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1051 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
1052 Acquired on acquisition of subsidiary Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
1053 Amortization Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
1054 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsIntangibleAssetsOtherThanGoodwill
1055 Balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1056 091 - Disclosure - Note 16 - Property, Plant and Equipment (Details Textual) Network

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1057 Statement Table [Table] Table

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 rhyth:StatementTable
1058 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1059 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1060 Computer equipment under finance lease [member] Member rhyth:ComputerEquipmentUnderFinanceLeaseMember
1061 Legal Entity [Axis] Axis dei:LegalEntityAxis
1062 Entity [Domain] Member dei:EntityDomain
1063 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1064 Property, plant and equipment at end of period Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1065 092 - Disclosure - Note 16 - Property, Plant and Equipment - Components of Property, Plant and Equipment (Details) Network

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1066 Statement Table [Table] Table

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 rhyth:StatementTable
1067 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1068 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1069 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1070 Accumulated depreciation and amortisation [member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
1071 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1072 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1073 Computer equipment [member] Member ifrs-full:ComputerEquipmentMember
1074 Fixtures, fittings and office equipment [member] Member rhyth:FixturesFittingsAndOfficeEquipmentMember
1075 Leasehold improvements [member] Member ifrs-full:LeaseholdImprovementsMember
1076 Legal Entity [Axis] Axis dei:LegalEntityAxis
1077 Entity [Domain] Member dei:EntityDomain
1078 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1079 Balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1080 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
1081 Acquired upon acquisition of subsidiary Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
1082 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
1083 Disposed of upon disposition of subsidiary Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughLossOfControlOfSubsidiaryPropertyPlantAndEquipment
1084 Exchange differences Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
1085 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
1086 Balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1087 093 - Disclosure - Note 17 - Subsidiaries - Subsidiary Interests (Details) Network

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1088 Statement Table [Table] Table

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 rhyth:StatementTable
1089 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1090 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1091 RhythmOne (US) Holdings, Inc. [member] Member rhyth:RhythmoneUsHoldingsIncMember
1092 RhythmOne, LLC [member] Member rhyth:RhythmoneLLCMember
1093 Blinkx (Canada), Inc. [member] Member rhyth:BlinkxCanadaIncMember
1094 Perk, Inc. [member] Member rhyth:PerkIncMember
1095 Perk.com U.S. Inc. [member] Member rhyth:PerkcomUsIncMember
1096 Perk.com Canada Inc. [member] Member rhyth:PerkcomCanadaIncMember
1097 Perk.com Software Private Limited [member] Member rhyth:PerkcomSoftwarePrivateLimitedMember
1098 YuMe, Inc. [member] Member rhyth:YumeIncMember
1099 YuMe Holdings [member] Member rhyth:YumeHoldingsMember
1100 YuMe Germany GmBH [member] Member rhyth:YumeGermanyGmbhMember
1101 YuMe Digital Advertising HK [member] Member rhyth:YumeDigitalAdvertisingHkMember
1102 YuMe Spain SL [member] Member rhyth:YumeSpainSlMember
1103 YuMe Europe Ltd [member] Member rhyth:YumeEuropeLtdMember
1104 YuMe Advertising Private LTD (Hong Kong) [member] Member rhyth:YumeAdvertisingPrivateLtdHongKongMember
1105 YuMe Advertising (China) Co Ltd. [member] Member rhyth:YumeAdvertisingChinaCoLtdMember
1106 YuMe Digital Advertising Mexico S De RL De Cv [member] Member rhyth:YumeDigitalAdvertisingMexicoSDeRlDeCvMember
1107 YuMe Chile SpA [member] Member rhyth:YumeChileSpaMember
1108 YuMe Advertising Private LTD (India) [member] Member rhyth:YumeAdvertisingPrivateLtdIndiaMember
1109 R1Demand, LLC (US) [member] Member rhyth:R1demandLlcUsMember
1110 RadiumOne UK Ltd (UK) [member] Member rhyth:RadiumoneUkLtdUkMember
1111 RadiumOne SARL (France) [member] Member rhyth:RadiumoneSarlFranceMember
1112 RadiumOne S.R.L. (Italy) [member] Member rhyth:RadiumoneSrlItalyMember
1113 RadiumOne Netherlands [member] Member rhyth:RadiumoneNetherlandsMember
1114 RadiumOne Singapore Pte. Ltd. [member] Member rhyth:RadiumoneSingaporePteLtdMember
1115 RadiumOne Pty Ltd. (Aus) [member] Member rhyth:RadiumonePtyLtdAusMember
1116 Legal Entity [Axis] Axis dei:LegalEntityAxis
1117 Entity [Domain] Member dei:EntityDomain
1118 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1119 Proportion of allotted share capital held Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
1120 Principal place of business Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfSubsidiary
1121 Country of registration Concept (Text/String) For Period ifrs-full:CountryOfIncorporationOrResidenceOfSubsidiary
1122 094 - Disclosure - Note 18 - Other Receivables and Restricted Cash (Details Textual) Network

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1123 Statement Table [Table] Table

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 rhyth:StatementTable
1124 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1125 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1126 Trade receivables [member] Member ifrs-full:TradeReceivablesMember
1127 Non-current assets represents deposits with financial institutions as a condition of certain property leases [member] Member rhyth:NoncurrentAssetsRepresentsDepositsWithFinancialInstitutionsAsAConditionOfCertainPropertyLeasesMember
1128 Current assets represents cash collateral against the term loan [member] Member rhyth:CurrentAssetsRepresentsCashCollateralAgainstTheTermLoanMember
1129 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1130 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1131 Financial assets past due but not impaired [member] Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
1132 Financial assets impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1133 Legal Entity [Axis] Axis dei:LegalEntityAxis
1134 Entity [Domain] Member dei:EntityDomain
1135 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1136 Average credit period taken on sales Concept (xbrli:durationItemType) For Period rhyth:AverageCreditPeriodTakenOnSales
1137 Financial assets at end of period Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1138 Interest expense on debt instruments issued Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnDebtInstrumentsIssued
1139 Restricted cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:RestrictedCashAndCashEquivalents
1140 095 - Disclosure - Note 18 - Other Receivables and Restricted Cash - Components of Other Receivables and Restricted Cash (Details) Network

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1141 Statement Table [Table] Table

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1142 Legal Entity [Axis] Axis dei:LegalEntityAxis
1143 Entity [Domain] Member dei:EntityDomain
1144 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1145 Trade receivables Concept (Monetary) As Of Debit ifrs-full:TradeReceivables
1146 Sales and doubtful debts allowance Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1147 NET TRADE RECEIVABLES Concept (Monetary) As Of Debit rhyth:NetTradeReceivables
1148 Other receivables and deposits Concept (Monetary) As Of Debit rhyth:OtherReceivablesAndDeposits
1149 Prepayments Concept (Monetary) As Of Debit ifrs-full:Prepayments
1150 Restricted cash amounts Concept (Monetary) As Of Debit ifrs-full:CurrentRestrictedCashAndCashEquivalents
1151 OTHER RECEIVABLES Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
1152 Other receivables Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentReceivables
1153 Restricted cash amounts Concept (Monetary) As Of Debit ifrs-full:NoncurrentRestrictedCashAndCashEquivalents
1154 OTHER RECEIVABLES AND RESTRICTED CASH Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentFinancialAssets
1155 096 - Disclosure - Note 18 - Other Receivables and Restricted Cash - Allowance for Doubtful Debts (Details) Network

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1156 Statement Table [Table] Table

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 rhyth:StatementTable
1157 Legal Entity [Axis] Axis dei:LegalEntityAxis
1158 Entity [Domain] Member dei:EntityDomain
1159 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1160 Balance at beginning of the Period Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1161 Receivables written off during the year as uncollectible Concept (Monetary) For Period Debit ifrs-full:UtilisationAllowanceAccountForCreditLossesOfFinancialAssets
1162 Allowance related to beginning balances of acquired subsidiaries Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
1163 Provision for receivables impairment Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAdjustmentsArisingFromPassageOfTimeAllowanceAccountForCreditLossesOfFinancialAssets
1164 Balance at end of the Period Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1165 097 - Disclosure - Note 18 - Other Receivables and Restricted Cash - Aging of Past Due Receivables (Details) Network

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1166 Statement Table [Table] Table

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1167 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1168 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1169 Financial assets past due but not impaired [member] Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
1170 Financial assets impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1171 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
1172 Past due status [member] Member ifrs-full:PastDueStatusMember
1173 Not later than three months [member] Member ifrs-full:NotLaterThanThreeMonthsMember
1174 Later than three months [member] Member ifrs-full:LaterThanThreeMonthsMember
1175 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1176 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1177 Trade receivables [member] Member ifrs-full:TradeReceivablesMember
1178 Legal Entity [Axis] Axis dei:LegalEntityAxis
1179 Entity [Domain] Member dei:EntityDomain
1180 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1181 Financial assets at end of period Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1182 098 - Disclosure - Note 19 - Marketable Securities (Details Textual) Network

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1183 Statement Table [Table] Table

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1184 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1185 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1186 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
1187 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1188 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1189 Financial assets impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1190 Legal Entity [Axis] Axis dei:LegalEntityAxis
1191 Entity [Domain] Member dei:EntityDomain
1192 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1193 Financial assets at end of period Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1194 099 - Disclosure - Note 19 - Marketable Securities - Changes in Marketable Securities (Details) Network

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1195 Statement Table [Table] Table

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 rhyth:StatementTable
1196 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1197 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1198 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
1199 Legal Entity [Axis] Axis dei:LegalEntityAxis
1200 Entity [Domain] Member dei:EntityDomain
1201 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1202 Balance at beginning of the Period Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1203 Additions Concept (Monetary) For Period Debit ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets
1204 Withdrawal Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughDerecognitionFinancialAssets
1205 Net gain / (loss) transfer to equity Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets
1206 Balance at the end the Period Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1207 Less non-current portion Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssets
1208 Current portion Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
1209 100 - Disclosure - Note 19 - Marketable Securities - Components of Marketable Securities (Details) Network

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1210 Statement Table [Table] Table

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 rhyth:StatementTable
1211 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1212 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1213 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
1214 Legal Entity [Axis] Axis dei:LegalEntityAxis
1215 Entity [Domain] Member dei:EntityDomain
1216 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1217 Corporate and government debt instruments Concept (Monetary) As Of Debit ifrs-full:DebtInstrumentsHeld
1218 Certificates of deposit Concept (Monetary) As Of Debit ifrs-full:LongtermDeposits
1219 Financial assets at end of period Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1220 101 - Disclosure - Note 20 - Deferred Tax (Details Textual) Network

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1221 Statement Table [Table] Table

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 rhyth:StatementTable
1222 Range [axis] Axis ifrs-full:RangeAxis
1223 Ranges [member] Member ifrs-full:RangesMember
1224 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1225 Top of range [member] Member ifrs-full:TopOfRangeMember
1226 Legal Entity [Axis] Axis dei:LegalEntityAxis
1227 Entity [Domain] Member dei:EntityDomain
1228 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1229 Deductible temporary differences for which no deferred tax asset is recognised Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
1230 Deferred tax liability (asset) at end of period Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1231 Unused tax losses and credits for which no deferred tax asset recognised Concept (Monetary) As Of rhyth:UnusedTaxLossesAndCreditsForWhichNoDeferredTaxAssetRecognised
1232 Expiration period, available credits and trading losses Concept (xbrli:durationItemType) For Period rhyth:ExpirationPeriodAvailableCreditsAndTradingLosses
1233 102 - Disclosure - Note 20 - Deferred Tax - Movement in Deferred Tax Assets and Liabilities (Details) Network

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1234 Statement Table [Table] Table

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 rhyth:StatementTable
1235 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
1236 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
1237 Temporary differences related to property, plant and equipment and intangible assets [member] Member rhyth:TemporaryDifferencesRelatedToPropertyPlantAndEquipmentAndIntangibleAssetsMember
1238 Unused tax credits and losses [member] Member rhyth:UnusedTaxCreditsAndLossesMember
1239 Temporary differences related to share-based payments [member] Member rhyth:TemporaryDifferencesRelatedToSharebasedPaymentsMember
1240 Other temporary differences [member] Member ifrs-full:OtherTemporaryDifferencesMember
1241 Legal Entity [Axis] Axis dei:LegalEntityAxis
1242 Entity [Domain] Member dei:EntityDomain
1243 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1244 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
1245 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
1246 Net deferred tax liabilities (assets) Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1247 Offset tax, deferred tax assets Concept (Monetary) As Of Credit rhyth:OffsetTaxesDeferredTaxAssets
1248 Offset tax, deferred tax liabilities Concept (Monetary) As Of Debit rhyth:OffsetTaxesDeferredTaxLiabilities
1249 Net deferred tax assets Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
1250 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:NetDeferredTaxLiabilities
1251 Balance Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1252 Recognized in income Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
1253 Recognized in goodwill Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
1254 Balance Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1255 103 - Disclosure - Note 21 - Other Payables and Provisions for Liabilities (Details Textual) Network

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1256 Statement Table [Table] Table

*

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 rhyth:StatementTable
1257 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1258 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1259 Revolving loan from Silicon Valley Bank [member] Member rhyth:RevolvingLoanFromSiliconValleyBankMember
1260 Subordinated Loan and Security Agreement from Silicon Valley Bank [member] Member rhyth:SubordinatedLoanAndSecurityAgreementFromSiliconValleyBankMember
1261 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1262 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1263 Fixed interest rate [member] Member ifrs-full:FixedInterestRateMember
1264 Range [axis] Axis ifrs-full:RangeAxis
1265 Ranges [member] Member ifrs-full:RangesMember
1266 Top of range [member] Member ifrs-full:TopOfRangeMember
1267 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1268 Legal Entity [Axis] Axis dei:LegalEntityAxis
1269 Entity [Domain] Member dei:EntityDomain
1270 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1271 Average credit period, payables Concept (xbrli:durationItemType) For Period rhyth:AverageCreditPeriodPayables
1272 Interest payable Concept (Monetary) As Of Credit ifrs-full:InterestPayable
1273 Accruals classified as non-current Concept (Monetary) As Of Credit ifrs-full:AccrualsClassifiedAsNoncurrent
1274 Finance lease liabilities Concept (Monetary) As Of Credit ifrs-full:FinanceLeaseLiabilities
1275 Revolving loans, maximum capacity Concept (Monetary) As Of Credit rhyth:RevolvingLoansMaximumCapacity
1276 Conditional maximum capacity of revolving loans Concept (Monetary) As Of Credit rhyth:ConditionalMaximumCapacityOfRevolvingLoans
1277 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1278 Total borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
1279 Total borrowing costs incurred Concept (Monetary) For Period ifrs-full:BorrowingCostsIncurred
1280 Borrowing costs amortised Concept (Monetary) For Period rhyth:BorrowingCostsAmortised
1281 Borrowing costs capitalised Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
1282 Total subordinated liabilities Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
1283 104 - Disclosure - Note 21 - Other Payables and Provisions for Liabilities - Components of Trade and Other Payables (Details) Network

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1284 Statement Table [Table] Table

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 rhyth:StatementTable
1285 Legal Entity [Axis] Axis dei:LegalEntityAxis
1286 Entity [Domain] Member dei:EntityDomain
1287 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1288 Trade payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
1289 Customer deposits Concept (Monetary) As Of Credit ifrs-full:CurrentDepositsFromCustomers
1290 Onerous lease provision Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
1291 Term loan Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
1292 Other accrued liabilities (including the amount of finance leases due within 12 months) Concept (Monetary) As Of Credit ifrs-full:AccrualsClassifiedAsCurrent
1293 Current Liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1294 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:NetDeferredTaxLiabilities
1295 Borrowings Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
1296 Onerous lease provision Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
1297 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentPayables
1298 Non-Current Liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
1299 105 - Disclosure - Note 21 - Other Payables and Provisions for Liabilities - Provisions (Details) Network

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1300 Statement Table [Table] Table

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1301 Legal Entity [Axis] Axis dei:LegalEntityAxis
1302 Entity [Domain] Member dei:EntityDomain
1303 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1304 Balance at beginning of the Period Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1305 Additional provision in the year Concept (Monetary) For Period Credit ifrs-full:AdditionalProvisionsOtherProvisions
1306 Utilization of provision Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
1307 Balance at end of the Period Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1308 106 - Disclosure - Note 21 - Other Payables and Provisions for Liabilities - Contractual Maturity of Non-Derivative Financial Liabilities (Details) Network

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1309 Statement Table [Table] Table

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 rhyth:StatementTable
1310 Maturity [axis] Axis ifrs-full:MaturityAxis
1311 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1312 Not later than one year [member] Member ifrs-full:NotLaterThanOneYearMember
1313 Later than one year and not later than five years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1314 Later than one year [member] Member ifrs-full:LaterThanOneYearMember
1315 Legal Entity [Axis] Axis dei:LegalEntityAxis
1316 Entity [Domain] Member dei:EntityDomain
1317 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1318 Amounts payable under finance leases Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
1319 Amounts payable under finance leases Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
1320 107 - Disclosure - Note 22 - Share Capital (Details Textual) Network

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1321 Statement Table [Table] Table

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 rhyth:StatementTable
1322 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
1323 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
1324 Original ordinary shares [member] Member rhyth:OriginalOrdinarySharesMember
1325 Consolidated ordinary shares [member] Member rhyth:ConsolidatedOrdinarySharesMember
1326 Ordinary shares issued for the exercise of employee share options [member] Member rhyth:OrdinarySharesIssuedForTheExerciseOfEmployeeShareOptionsMember
1327 Ordinary shares issued related to restricted stock units [member] Member rhyth:OrdinarySharesIssuedRelatedToRestrictedStockUnitsMember
1328 Range [axis] Axis ifrs-full:RangeAxis
1329 Ranges [member] Member ifrs-full:RangesMember
1330 Top of range [member] Member ifrs-full:TopOfRangeMember
1331 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1332 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1333 YuMe, Inc. [member] Member rhyth:YumeIncMember
1334 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
1335 Perk, Inc. [member] Member rhyth:PerkIncMember
1336 Legal Entity [Axis] Axis dei:LegalEntityAxis
1337 Entity [Domain] Member dei:EntityDomain
1338 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1339 Number of shares outstanding at end of period Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
1340 Weighted average share price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePrice
1341 Number of ordinary shares issued for ten former shares Concept (Shares) For Period rhyth:NumberOfOrdinarySharesIssuedForTenFormerShares
1342 Total number of shares issued Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
1343 Number of instruments or interests issued or issuable Concept (Decimal) As Of ifrs-full:NumberOfInstrumentsOrInterestsIssuedOrIssuable
1344 108 - Disclosure - Note 22 - Share Capital - Components of Issued and Fully Paid (Details) Network

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1345 Statement Table [Table] Table

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1346 Legal Entity [Axis] Axis dei:LegalEntityAxis
1347 Entity [Domain] Member dei:EntityDomain
1348 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1349 77,535,770 ordinary shares of 10 pence each (2017: 49,509,394 ordinary shares of 1 pence each) Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
1350 109 - Disclosure - Note 22 - Share Capital - Components of Issued and Fully Paid (Details) (Parentheticals) Network

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1351 Statement Table [Table] Table

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1352 Legal Entity [Axis] Axis dei:LegalEntityAxis
1353 Entity [Domain] Member dei:EntityDomain
1354 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1355 ordinary shares (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesIssuedAndFullyPaid
1356 Weighted average share price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePrice
1357 110 - Disclosure - Note 23 - Capitalization and Capital Reduction (Details Textual) Network

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1358 Statement Table [Table] Table

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1359 Legal Entity [Axis] Axis dei:LegalEntityAxis
1360 Entity [Domain] Member dei:EntityDomain
1361 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1362 Deferred shares issued Concept (Shares) As Of rhyth:DeferredSharesIssued
1363 111 - Disclosure - Note 24 - Share Premium Account - Components of Share Premium (Details) Network

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1364 Statement Table [Table] Table

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 rhyth:StatementTable
1365 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
1366 Equity [member] Member ifrs-full:EquityMember
1367 Share premium [member] Member ifrs-full:SharePremiumMember
1368 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1369 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1370 RadiumOne, Inc. [member] Member rhyth:RadiumoneIncMember
1371 YuMe, Inc. [member] Member rhyth:YumeIncMember
1372 Legal Entity [Axis] Axis dei:LegalEntityAxis
1373 Entity [Domain] Member dei:EntityDomain
1374 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1375 Balance Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
1376 Premium arising on issue of equity shares, net of costs Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
1377 Premium arising on issue of equity shares Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary
1378 Capitalization of merger reserve Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransferToStatutoryReserve
1379 Capital reduction Concept (Monetary) For Period Debit ifrs-full:ReductionOfIssuedCapital
1380 Balance Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
1381 112 - Disclosure - Note 25 - Shares to be Issued and Merger Reserve (Details Textual) Network

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1382 Statement Table [Table] Table

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1383 Legal Entity [Axis] Axis dei:LegalEntityAxis
1384 Entity [Domain] Member dei:EntityDomain
1385 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1386 Merger reserve minimum consideration required Concept (Percent) As Of rhyth:MergerReserveMinimumConsiderationRequired
1387 113 - Disclosure - Note 26 - Operating Lease Arrangements (Details Textual) Network

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1388 Statement Table [Table] Table

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1389 Range [axis] Axis ifrs-full:RangeAxis
1390 Ranges [member] Member ifrs-full:RangesMember
1391 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1392 Top of range [member] Member ifrs-full:TopOfRangeMember
1393 Legal Entity [Axis] Axis dei:LegalEntityAxis
1394 Entity [Domain] Member dei:EntityDomain
1395 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1396 Operating lease term Concept (xbrli:durationItemType) For Period rhyth:OperatingLeaseTerm
1397 114 - Disclosure - Note 26 - Operating Lease Arrangements - Financial Statement Amounts (Details) Network

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1398 Statement Table [Table] Table

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 rhyth:StatementTable
1399 Maturity [axis] Axis ifrs-full:MaturityAxis
1400 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1401 Not later than one year [member] Member ifrs-full:NotLaterThanOneYearMember
1402 Later than one year and not later than five years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1403 Later than five years [member] Member ifrs-full:LaterThanFiveYearsMember
1404 Legal Entity [Axis] Axis dei:LegalEntityAxis
1405 Entity [Domain] Member dei:EntityDomain
1406 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1407 Lease payments under operating leases recognized as an expense in the year Concept (Monetary) For Period Debit ifrs-full:LeaseAndSubleasePaymentsRecognisedAsExpense
1408 Operating lease payable Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayable
1409 Amounts due to be received under non-cancellable sub-lease agreements Concept (Monetary) As Of Debit ifrs-full:ExpectedFutureMinimumSubleasePaymentsReceivableUnderNoncancellableSubleasesClassifiedAsOperatingLease
1410 Operating lease obligations, net of sub-lease amounts Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsOfArrangementsThatIncludePaymentsForNonleaseElements
1411 115 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes (Details Textual) Network

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1412 Statement Table [Table] Table

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1413 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1414 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1415 Restricted stock units [member] Member rhyth:RestrictedStockUnitsMember
1416 Legal Entity [Axis] Axis dei:LegalEntityAxis
1417 Entity [Domain] Member dei:EntityDomain
1418 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1419 Vesting period Concept (xbrli:durationItemType) For Period rhyth:VestingPeriod
1420 Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise
1421 Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1422 Option life, share options granted Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
1423 Weighted average exercise price of share options granted in share-based payment arrangement Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
1424 Number of share options exercised in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1425 Number of share options granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1426 Number of other equity instruments granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1427 Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1428 116 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes - Share-Based Compensation Expense (Details) Network

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1429 Statement Table [Table] Table

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 rhyth:StatementTable
1430 Legal Entity [Axis] Axis dei:LegalEntityAxis
1431 Entity [Domain] Member dei:EntityDomain
1432 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1433 Operating expenses Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
1434 117 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes - Change in Options (Details) Network

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1435 Statement Table [Table] Table

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*

 rhyth:StatementTable
1436 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1437 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1438 The RhythmOne EMI scheme and the RhythmOne US plan [member] Member rhyth:TheRhythmoneEmiSchemeAndTheRhythmoneUsPlanMember
1439 Autonomy Discretionary Share Scheme and Autonomy US Plan options [member] Member rhyth:AutonomyDiscretionaryShareSchemeAndAutonomyUsPlanOptionsMember
1440 Legal Entity [Axis] Axis dei:LegalEntityAxis
1441 Entity [Domain] Member dei:EntityDomain
1442 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1443 Outstanding balance at beginning of year, shares Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1444 Outstanding balance at beginning of year, weighted average Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1445 Number of share options granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1446 Weighted average exercise price of share options granted in share-based payment arrangement Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
1447 Exercised during the year, shares Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1448 Exercised during the year, weighted average Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
1449 Forfeited during the year, shares Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
1450 Forfeited during the year, weighted average Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
1451 Outstanding balance at end of year, shares Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1452 Outstanding balance at end of year, weighted average Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1453 Exercisable at end of year, shares Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1454 Exercisable at end of year, weighted average Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1455 Lapsed during the year, shares Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExpiredInSharebasedPaymentArrangement
1456 Lapsed during the year, weighted average Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement
1457 118 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes - Assumptions (Details) Network

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1458 Statement Table [Table] Table

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*

 rhyth:StatementTable
1459 Range [axis] Axis ifrs-full:RangeAxis
1460 Ranges [member] Member ifrs-full:RangesMember
1461 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1462 Top of range [member] Member ifrs-full:TopOfRangeMember
1463 Legal Entity [Axis] Axis dei:LegalEntityAxis
1464 Entity [Domain] Member dei:EntityDomain
1465 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1466 Weighted average share price (in pound sterling) Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
1467 Weighted average exercise price (in pound sterling) Concept (Monetary) For Period ifrs-full:ExercisePriceShareOptionsGranted
1468 Expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
1469 Expected life (in years) Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
1470 Risk free rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
1471 119 - Disclosure - Note 27 - Share-Based Payment and Equity Settled Share Option Schemes - RSU's (Details) Network

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1472 Statement Table [Table] Table

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*

 rhyth:StatementTable
1473 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1474 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1475 Restricted stock units [member] Member rhyth:RestrictedStockUnitsMember
1476 Legal Entity [Axis] Axis dei:LegalEntityAxis
1477 Entity [Domain] Member dei:EntityDomain
1478 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1479 Outstanding balance at beginning of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1480 Number of other equity instruments granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1481 RSUs vested Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1482 RSUs forfeited Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1483 Outstanding balance at end of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1484 120 - Disclosure - Note 28 - Financial Instruments (Details Textual) Network

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1485 Statement Table [Table] Table

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*

 rhyth:StatementTable
1486 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1487 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1488 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
1489 Legal Entity [Axis] Axis dei:LegalEntityAxis
1490 Entity [Domain] Member dei:EntityDomain
1491 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1492 Percentage of entity's revenue Concept (Percent) For Period ifrs-full:PercentageOfEntitysRevenue
1493 Number of major customers Concept (Decimal) As Of rhyth:NumberOfMajorCustomers
1494 Percentage of entity's gross assets Concept (Percent) For Period rhyth:PercentageOfEntitysGrossAssets
1495 Financial assets at end of period Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1496 121 - Disclosure - Note 28 - Financial Instruments - Financial Assets and Liabilities (Details) Network

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1497 Statement Table [Table] Table

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*

 rhyth:StatementTable
1498 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1499 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1500 Cash and cash equivalents [member] Member rhyth:CashAndCashEquivalentsMember
1501 Trade receivables [member] Member ifrs-full:TradeReceivablesMember
1502 Restricted cash and other receivables [member] Member rhyth:RestrictedCashAndOtherReceivablesMember
1503 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
1504 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1505 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
1506 Provisions [member] Member rhyth:ProvisionsMember
1507 Borrowings [member] Member rhyth:BorrowingsMember
1508 Term loan [member] Member rhyth:TermLoanMember
1509 Trade and other payables [member] Member rhyth:TradeAndOtherPayablesMember
1510 Legal Entity [Axis] Axis dei:LegalEntityAxis
1511 Entity [Domain] Member dei:EntityDomain
1512 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1513 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1514 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
1515 122 - Disclosure - Note 28 - Financial Instruments - Currency Risk (Details) Network

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1516 Statement Table [Table] Table

*

*

 rhyth:StatementTable
1517 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1518 Risks [member] Member ifrs-full:TypesOfRisksMember
1519 Currency risk [member] Member ifrs-full:CurrencyRiskMember
1520 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1521 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1522 Cash and cash equivalents [member] Member rhyth:CashAndCashEquivalentsMember
1523 Trade and other receivables [member] Member rhyth:TradeAndOtherReceivablesMember
1524 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1525 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
1526 Trade and other payables [member] Member rhyth:TradeAndOtherPayablesMember
1527 Legal Entity [Axis] Axis dei:LegalEntityAxis
1528 Entity [Domain] Member dei:EntityDomain
1529 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1530 Financial assets Concept (Monetary) For Period Debit rhyth:EffectOfTwentyPercentChangeInFunctionalCurrencyAgainstRelevantForeignCurrencyOnFinancialAssets
1531 Financial liabilities Concept (Monetary) For Period Credit rhyth:EffectOfTwentyPercentChangeInFunctionalCurrencyAgainstRelevantForeignCurrencyOnFinancialLiabilities
1532 123 - Disclosure - Note 29 - Exceptional Items From Continuing Operations (Details Textual) Network

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1533 Statement Table [Table] Table

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*

 rhyth:StatementTable
1534 Legal Entity [Axis] Axis dei:LegalEntityAxis
1535 Entity [Domain] Member dei:EntityDomain
1536 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1537 Adjustments for deferred tax expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
1538 124 - Disclosure - Note 29 - Exceptional Items From Continuing Operations - Exceptional Items (Details) Network

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1539 Statement Table [Table] Table

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*

 rhyth:StatementTable
1540 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
1541 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
1542 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
1543 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1544 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1545 YuMe, RadiumOne and Perk [member] Member rhyth:YuMeRadiumOneAndPerkMember
1546 Legal Entity [Axis] Axis dei:LegalEntityAxis
1547 Entity [Domain] Member dei:EntityDomain
1548 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1549 Severance and retention costs Concept (Monetary) For Period Debit rhyth:SeveranceAndRetentionCost
1550 Onerous lease Concept (Monetary) For Period Debit rhyth:OnerousLease
1551 Professional services Concept (Monetary) For Period Debit ifrs-full:ProfessionalFeesExpense
1552 Total acquisition-related exceptional items Concept (Monetary) For Period Debit rhyth:AcquisitionRelatedCosts
1553 Goodwill impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossGoodwill
1554 Amortization Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
1555 Restructuring charges Concept (Monetary) For Period Debit ifrs-full:ExpenseOfRestructuringActivities
1556 Severance costs Concept (Monetary) For Period Debit rhyth:SeveranceCost
1557 Litigation settlement Concept (Monetary) For Period Debit ifrs-full:LossesOnLitigationSettlements
1558 Total other exceptional items Concept (Monetary) For Period Debit rhyth:OtherExceptionalCosts
1559 Remeasurement of deferred consideration Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
1560 Total remeasurement of deferred consideration Concept (Monetary) For Period Debit rhyth:TotalRemeasurementOfDeferredConsideration
1561 Total exceptional items Concept (Monetary) For Period Debit rhyth:AcquisitionAndExceptionalCosts
1562 125 - Disclosure - Note 30 - Operating Expenses by Nature From Continuing Operations - Operating Expenses (Details) Network

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1563 Statement Table [Table] Table

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 rhyth:StatementTable
1564 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
1565 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
1566 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
1567 Legal Entity [Axis] Axis dei:LegalEntityAxis
1568 Entity [Domain] Member dei:EntityDomain
1569 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1570 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
1571 Market research, public and investor relations, branding Concept (Monetary) For Period Debit ifrs-full:AdvertisingExpense
1572 Occupancy Concept (Monetary) For Period Debit ifrs-full:OccupancyExpense
1573 Other expenses(a) Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
1574 Professional services Concept (Monetary) For Period Debit ifrs-full:ProfessionalFeesExpense
1575 Salaries & wages Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
1576 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
1577 Technology Concept (Monetary) For Period Debit rhyth:TechnologyExpense
1578 Travel Concept (Monetary) For Period Debit ifrs-full:TravelExpense
1579 Operating expenses from continuing operations Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
1580 126 - Disclosure - Note 31 - Related Party Transactions (Details Textual) Network

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1581 Statement Table [Table] Table

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 rhyth:StatementTable
1582 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1583 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1584 Non-executive directors [member] Member rhyth:NonexecutiveDirectorsMember
1585 Director, Edward Hastings [member] Member rhyth:DirectorEdwardHastingsMember
1586 Legal Entity [Axis] Axis dei:LegalEntityAxis
1587 Entity [Domain] Member dei:EntityDomain
1588 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1589 Non-executive director fees Concept (Monetary) For Period Debit rhyth:NonexecutiveDirectorFees
1590 Executive director fees Concept (Monetary) For Period Debit rhyth:ExecutiveDirectorFees
1591 Functional currency exchange rate Concept (Decimal) As Of rhyth:FunctionalCurrencyExchangeRate
1592 Key management personnel compensation, annual bonus Concept (Monetary) For Period Debit rhyth:KeyManagementPersonnelCompensationAnnualBonus
1593 Percentage of options granted under accelerated vesting Concept (Percent) For Period rhyth:PercentageOfOptionsGrantedUnderAcceleratedVesting
1594 127 - Disclosure - Note 31 - Related Party Transactions - Remuneration of Directors (Details) Network

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1595 Statement Table [Table] Table

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*

 rhyth:StatementTable
1596 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1597 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1598 Director, Subhransu Mukherjee [member] Member rhyth:DirectorSubhransuMukherjeeMember
1599 Director, Edward Reginelli [member] Member rhyth:DirectorEdwardReginelliMember
1600 Director, Edward Hastings [member] Member rhyth:DirectorEdwardHastingsMember
1601 Director, Raj Chellaraj [member] Member rhyth:DirectorRajChellarajMember
1602 Director, Suranga Chandratillake [member] Member rhyth:DirectorSurangaChandratillakeMember
1603 Director, Andy Cunningham [member] Member rhyth:DirectorAndyCunninghamMember
1604 Director, Ujjal Kohli [member] Member rhyth:DirectorUjjalKohliMember
1605 Director, Mark Opzoomer [member] Member rhyth:DirectorMarkOpzoomerMember
1606 Director, Eric Singer [member] Member rhyth:DirectorEricSingerMember
1607 Director, John Mutch [member] Member rhyth:DirectorJohnMutchMember
1608 Legal Entity [Axis] Axis dei:LegalEntityAxis
1609 Entity [Domain] Member dei:EntityDomain
1610 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1611 Base salary/NED fees Concept (Monetary) For Period Debit rhyth:KeyManagementPersonnelCompensationBaseSalaryAndFees
1612 Annual bonus Concept (Monetary) For Period Debit rhyth:KeyManagementPersonnelCompensationAnnualBonus
1613 Compensation for loss of office Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
1614 Year ended Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1615 128 - Disclosure - Note 31 - Related Party Transactions - Options and RSUs (Details) Network

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1616 Statement Table [Table] Table

*

*

 rhyth:StatementTable
1617 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1618 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1619 Director, Edward Hastings [member] Member rhyth:DirectorEdwardHastingsMember
1620 Director, Edward Reginelli [member] Member rhyth:DirectorEdwardReginelliMember
1621 Director, Subhransu Mukherjee [member] Member rhyth:DirectorSubhransuMukherjeeMember
1622 Director, Suranga Chandratillake [member] Member rhyth:DirectorSurangaChandratillakeMember
1623 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1624 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1625 Restricted stock units issued to directors [member] Member rhyth:RestrictedStockUnitsIssuedToDirectorsMember
1626 Range [axis] Axis ifrs-full:RangeAxis
1627 Ranges [member] Member ifrs-full:RangesMember
1628 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1629 Top of range [member] Member ifrs-full:TopOfRangeMember
1630 Legal Entity [Axis] Axis dei:LegalEntityAxis
1631 Entity [Domain] Member dei:EntityDomain
1632 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1633 Outstanding balance at beginning of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1634 Number of other equity instruments granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1635 Outstanding balance at end of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1636 Granted number Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1637 Vested number Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1638 Outstanding balance at beginning of year, shares Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1639 Number of share options granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1640 Exercised Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1641 Outstanding balance at end of year, shares Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1642 Number vested Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1643 Market prices Concept (Monetary) For Period ifrs-full:WeightedAverageSharePrice
1644 Market prices at vesting date Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1645 129 - Disclosure - Note 32 - Events After The Balance Sheet Date (Details Textual) Network

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1646 Statement Table [Table] Table

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 rhyth:StatementTable
1647 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1648 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
1649 Employment agreement [member] Member rhyth:EmploymentAgreementMember
1650 Major ordinary share transactions [member] Member ifrs-full:MajorOrdinaryShareTransactionsMember
1651 Legal Entity [Axis] Axis dei:LegalEntityAxis
1652 Entity [Domain] Member dei:EntityDomain
1653 Statement Line Items [Line Items] LineItems rhyth:StatementLineItems
1654 Key management personnel compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1655 Key management personnel compensation, signing bonus Concept (Monetary) For Period Debit rhyth:KeyManagementPersonnelCompensationSigningBonus
1656 Authorised share price of future issuance of ordinary shares Concept (Share) As Of rhyth:AuthorisedSharePriceOfFutureIssuanceOfOrdinaryShares

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