BENITEC BIOPHARMA LTD/ADR (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line	Label	Object Class	Period Type	Balance	Report ElementName
1	100000 - Document - Document and Entity Information	Network	*	*	http://benitec.com/20180630/taxonomy/role/DocumentDocumentAndEntityInformation
2	Implied Table	Table	*	*	implied:Table
3	Document And Entity Information [Abstract]	Abstract			bntc:DocumentAndEntityInformationAbstract
4	Document Type	Concept (Submission Type)	For Period		dei:DocumentType
5	Amendment Flag	Concept (Yes/No)	For Period		dei:AmendmentFlag
6	Document Period End Date	Concept (Date)	For Period		dei:DocumentPeriodEndDate
7	Document Fiscal Year Focus	Concept (Year)	For Period		dei:DocumentFiscalYearFocus
8	Document Fiscal Period Focus	Concept (Fiscal Period)	For Period		dei:DocumentFiscalPeriodFocus
9	Trading Symbol	Concept (Text/String)	For Period		dei:TradingSymbol
10	Entity Registrant Name	Concept (Text/String)	For Period		dei:EntityRegistrantName
11	Entity Central Index Key	Concept (CIK Number)	For Period		dei:EntityCentralIndexKey
12	Current Fiscal Year End Date	Concept (Month/Day)	For Period		dei:CurrentFiscalYearEndDate
13	Entity Well-known Seasoned Issuer	Concept (Yes/No)	For Period		dei:EntityWellKnownSeasonedIssuer
14	Entity Current Reporting Status	Concept (Yes/No)	For Period		dei:EntityCurrentReportingStatus
15	Entity Filer Category	Concept (Filer Category)	For Period		dei:EntityFilerCategory
16	Entity Common Stock, Shares Outstanding	Concept (Shares)	As Of		dei:EntityCommonStockSharesOutstanding
17	100010 - Statement - Consolidated Statement of Profit or Loss and Other Comprehensive Income	Network	*	*	http://benitec.com/20180630/taxonomy/role/StatementConsolidatedStatementOfProfitOrLossAndOtherComprehensiveIncome
18	Implied Table	Table	*	*	implied:Table
19	Income Statement [Abstract]	Abstract			ifrs-full:IncomeStatementAbstract
20	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
21	Other income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherIncome
22	Total Income	Concept (Monetary)	For Period	Credit	bntc:RevenueAndOtherIncome
23	Expenses	Abstract			ifrs-full:ExpenseByNatureAbstract
24	Royalties and licence fees	Concept (Monetary)	For Period	Debit	bntc:RoyaltiesAndLicenceFees
25	Research and development	Concept (Monetary)	For Period	Debit	ifrs-full:ResearchAndDevelopmentExpense
26	Employee benefits expense	Concept (Monetary)	For Period	Debit	ifrs-full:EmployeeBenefitsExpense
27	Share-based expense	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
28	Travel related costs	Concept (Monetary)	For Period	Debit	ifrs-full:TravelExpense
29	Consultants costs	Concept (Monetary)	For Period	Debit	ifrs-full:ProfessionalFeesExpense
30	Occupancy costs	Concept (Monetary)	For Period	Debit	ifrs-full:OccupancyExpense
31	Depreciation	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationExpense
32	Corporate expenses	Concept (Monetary)	For Period	Debit	bntc:CorporateExpenses
33	Foreign exchange realized loss	Concept (Monetary)	For Period	Debit	bntc:ForeignExchangeRealizedLoss
34	Foreign exchange unrealized loss	Concept (Monetary)	For Period	Debit	bntc:ForeignExchangeUnrealizedLoss
35	IPO costs	Concept (Monetary)	For Period	Debit	ifrs-full:ShareIssueRelatedCost
36	Change in market value of listed investment	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnAvailableforsaleFinancialAssets
37	Loss on disposal of fixed assets	Concept (Monetary)	For Period	Debit	ifrs-full:LossesOnDisposalsOfPropertyPlantAndEquipment
38	Write-off of clinical trial prepayment	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossRecognisedInProfitOrLoss
39	Total Expenses	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseByNature
40	Loss before income tax	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
41	Income tax	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
42	Loss after income tax for the period attributable to the owners of Benitec Biopharma Limited	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
43	Other comprehensive income	Abstract			ifrs-full:OtherComprehensiveIncomeAbstract
44	Foreign currency translation loss	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
45	Total comprehensive loss for the period attributable to the owners of Benitec Biopharma Limited	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
46	Basic loss for the twelve months, cents per share	Concept (Share)	For Period		ifrs-full:BasicEarningsLossPerShare
47	Diluted loss for the twelve months, cents per share	Concept (Share)	For Period		ifrs-full:DilutedEarningsLossPerShare
48	100020 - Statement - Consolidated Statement of Financial Position	Network	*	*	http://benitec.com/20180630/taxonomy/role/StatementConsolidatedStatementOfFinancialPosition
49	Implied Table	Table	*	*	implied:Table
50	Statement Of Financial Position [Abstract]	Abstract			ifrs-full:StatementOfFinancialPositionAbstract
51	ASSETS	Abstract			ifrs-full:AssetsAbstract
52	Current Assets	Abstract			ifrs-full:CurrentAssetsAbstract
53	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
54	Other financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentFinancialAssets
55	Trade and other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivables
56	Other assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentNonfinancialAssets
57	Total Current Assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
58	Non-Current Assets	Abstract			ifrs-full:NoncurrentAssetsAbstract
59	Deposits	Concept (Monetary)	As Of	Debit	ifrs-full:LongtermDeposits
60	Plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
61	Total Non-Current Assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssets
62	TOTAL ASSETS	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
63	LIABILITIES	Abstract			ifrs-full:LiabilitiesAbstract
64	Current Liabilities	Abstract			ifrs-full:CurrentLiabilitiesAbstract
65	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
66	Provisions	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentProvisions
67	Total Current Liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
68	Non-Current Liabilities	Abstract			ifrs-full:NoncurrentLiabilitiesAbstract
69	Provisions	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentProvisions
70	Total Non-Current Liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentLiabilities
71	TOTAL LIABILITIES	Concept (Monetary)	As Of	Credit	ifrs-full:Liabilities
72	NET ASSETS	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
73	EQUITY	Abstract			ifrs-full:EquityAbstract
74	Issued capital	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
75	Reserves	Concept (Monetary)	As Of	Credit	ifrs-full:OtherReserves
76	Accumulated losses	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
77	TOTAL EQUITY	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
78	100030 - Statement - Consolidated Statement of Changes in Equity	Network	*	*	http://benitec.com/20180630/taxonomy/role/StatementConsolidatedStatementOfChangesInEquity
79	Statement Of Changes In Equity [Table]	Table	*	*	ifrs-full:StatementOfChangesInEquityTable
80	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
81	Equity [member]	Member			ifrs-full:EquityMember
82	Issued Capital [Member]	Member			ifrs-full:IssuedCapitalMember
83	Reserves [Member]	Member			ifrs-full:OtherReservesMember
84	Accumulated Losses [Member]	Member			ifrs-full:RetainedEarningsMember
85	Statement Of Changes In Equity [Line Items]	LineItems			ifrs-full:StatementOfChangesInEquityLineItems
86	Beginning balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
87	Loss after income tax benefit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
88	Other comprehensive income - Foreign exchange translation reserve	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
89	Total comprehensive loss for the period attributable to the owners of Benitec Biopharma Limited	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
90	Contributions of equity, net of transaction costs	Concept (Monetary)	For Period	Credit	ifrs-full:IssueOfEquity
91	Share-based payments	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
92	Transfer of expired share-based payments	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughTransferBetweenRevaluationReserveAndRetainedEarnings
93	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
94	100040 - Statement - Consolidated Statement of Cash Flows	Network	*	*	http://benitec.com/20180630/taxonomy/role/StatementConsolidatedStatementOfCashFlows
95	Implied Table	Table	*	*	implied:Table
96	Statement Of Cash Flows [Abstract]	Abstract			ifrs-full:StatementOfCashFlowsAbstract
97	Cash flows from operating activities	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
98	Receipts from customers	Concept (Monetary)	For Period	Debit	ifrs-full:ReceiptsFromSalesOfGoodsAndRenderingOfServices
99	Interest received	Concept (Monetary)	For Period	Debit	ifrs-full:InterestReceivedClassifiedAsOperatingActivities
100	Government grants	Concept (Monetary)	For Period	Debit	bntc:ProceedsFromGovernmentGrantsClassifiedAsOperatingActivities
101	Receipts of CRO prepayment	Concept (Monetary)	For Period	Debit	bntc:ReceiptsOfCROPrepayment
102	Payments to suppliers and employees	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsToSuppliersForGoodsAndServicesAndToAndOnBehalfOfEmployees
103	Net cash used in operating activities	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperatingActivities
104	Cash flows from investing activities	Abstract			ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
105	Payments for plant and equipment	Concept (Monetary)	For Period	Credit	ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
106	Proceeds from disposal of plant and equipment	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
107	Security deposits	Concept (Monetary)	For Period	Credit	bntc:PaymentsForSecurityDeposits
108	Clinical trial deposit	Concept (Monetary)	For Period	Credit	bntc:PaymentsForClinicalTrialDeposit
109	Net cash used in investing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInInvestingActivities
110	Cash flows from financing activities	Abstract			ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
111	Proceeds from issue of shares	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromIssuingShares
112	IPO and share issue transaction cost	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsForShareIssueCosts
113	Net cash from financing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInFinancingActivities
114	Net (decrease)/increase in cash and cash equivalents	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
115	Cash and cash equivalents at beginning of the period	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
116	Effects of exchange rate changes on cash and cash equivalents	Concept (Monetary)	For Period	Debit	ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
117	Cash and cash equivalents at end of the period	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
118	100050 - Disclosure - Significant Accounting Policies	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureSignificantAccountingPolicies
119	Implied Table	Table	*	*	implied:Table
120	Disclosure Of Significant Accounting Policies [Abstract]	Abstract			bntc:DisclosureOfSignificantAccountingPoliciesAbstract
121	Significant Accounting Policies	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
122	100060 - Disclosure - Critical Accounting Judgements, Estimates and Assumptions	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCriticalAccountingJudgementsEstimatesAndAssumptions
123	Implied Table	Table	*	*	implied:Table
124	Disclosure Of Changes In Accounting Estimates [Abstract]	Abstract			ifrs-full:DisclosureOfChangesInAccountingEstimatesAbstract
125	Critical Accounting Judgements, Estimates and Assumptions	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
126	100070 - Disclosure - Operating Segments	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureOperatingSegments
127	Implied Table	Table	*	*	implied:Table
128	Disclosure Of Operating Segments [Abstract]	Abstract			ifrs-full:DisclosureOfOperatingSegmentsAbstract
129	Operating Segments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
130	100080 - Disclosure - Revenue and Other Income	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRevenueAndOtherIncome
131	Implied Table	Table	*	*	implied:Table
132	Material Income And Expense [Abstract]	Abstract			ifrs-full:MaterialIncomeAndExpenseAbstract
133	Revenue and Other Income	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfRevenueAndOtherIncomeExplanatory
134	100090 - Disclosure - Expenses	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureExpenses
135	Implied Table	Table	*	*	implied:Table
136	Material Income And Expense [Abstract]	Abstract			ifrs-full:MaterialIncomeAndExpenseAbstract
137	Expenses	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfExpensesExplanatory
138	100100 - Disclosure - Income Tax Benefit	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIncomeTaxBenefit
139	Implied Table	Table	*	*	implied:Table
140	Major Components Of Tax Expense Income [Abstract]	Abstract			ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
141	Income Tax Benefit	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIncomeTaxExplanatory
142	100110 - Disclosure - Cash and Cash Equivalents	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCashAndCashEquivalents
143	Implied Table	Table	*	*	implied:Table
144	Cash And Cash Equivalents [Abstract]	Abstract			ifrs-full:CashAndCashEquivalentsAbstract
145	Cash and Cash Equivalents	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
146	100120 - Disclosure - Other Financial Assets	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureOtherFinancialAssets
147	Implied Table	Table	*	*	implied:Table
148	Disclosure Of Financial Assets [Abstract]	Abstract			ifrs-full:DisclosureOfFinancialAssetsAbstract
149	Other Financial Assets	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfOtherFinancialAssetsExplanatory
150	100130 - Disclosure - Trade and Other Receivables	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureTradeAndOtherReceivables
151	Implied Table	Table	*	*	implied:Table
152	Trade And Other Current Receivables [Abstract]	Abstract			ifrs-full:TradeAndOtherCurrentReceivablesAbstract
153	Trade and Other Receivables	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
154	100140 - Disclosure - Current Assets - Other	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCurrentAssetsOther
155	Implied Table	Table	*	*	implied:Table
156	Subclassifications Of Assets Liabilities And Equities [Abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
157	Current Assets - Other	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherCurrentAssetsExplanatory
158	100150 - Disclosure - Deposits Non-current	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureDepositsNonCurrent
159	Implied Table	Table	*	*	implied:Table
160	Subclassifications Of Assets Liabilities And Equities [Abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
161	Deposits Non-current	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDepositsNonCurrentExplanatory
162	100160 - Disclosure - Property, Plant and Equipment	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosurePropertyPlantAndEquipment
163	Implied Table	Table	*	*	implied:Table
164	Disclosure Of Property Plant And Equipment [Abstract]	Abstract			ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
165	Property, Plant and Equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
166	100170 - Disclosure - Trade and Other Payables	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureTradeAndOtherPayables
167	Implied Table	Table	*	*	implied:Table
168	Trade And Other Payables [Abstract]	Abstract			ifrs-full:TradeAndOtherPayablesAbstract
169	Trade and Other Payables	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
170	100180 - Disclosure - Provisions	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureProvisions
171	Implied Table	Table	*	*	implied:Table
172	Provisions [Abstract]	Abstract			ifrs-full:ProvisionsAbstract
173	Provisions	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfProvisionsExplanatory
174	100190 - Disclosure - Issued Capital	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIssuedCapital
175	Implied Table	Table	*	*	implied:Table
176	Disclosure Of Classes Of Share Capital [Abstract]	Abstract			ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
177	Issued Capital	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIssuedCapitalExplanatory
178	100200 - Disclosure - Reserves	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureReserves
179	Implied Table	Table	*	*	implied:Table
180	Disclosure Of Reserves Within Equity [Abstract]	Abstract			ifrs-full:DisclosureOfReservesWithinEquityAbstract
181	Reserves	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfReservesAndOtherEquityInterestExplanatory
182	100210 - Disclosure - Accumulated losses	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureAccumulatedLosses
183	Implied Table	Table	*	*	implied:Table
184	Retained Earnings [Abstract]	Abstract			bntc:RetainedEarningsAbstract
185	Accumulated Losses	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfRetainedEarningsExplanatory
186	100220 - Disclosure - Dividends	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureDividends
187	Implied Table	Table	*	*	implied:Table
188	Disclosure Of Dividends [Abstract]	Abstract			bntc:DisclosureOfDividendsAbstract
189	Dividends	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDividendsExplanatory
190	100230 - Disclosure - Financial Instruments	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureFinancialInstruments
191	Implied Table	Table	*	*	implied:Table
192	Disclosure Of Financial Instruments [Abstract]	Abstract			ifrs-full:DisclosureOfFinancialInstrumentsAbstract
193	Financial Instruments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
194	100240 - Disclosure - Remuneration of Auditors	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRemunerationOfAuditors
195	Implied Table	Table	*	*	implied:Table
196	Auditors Remuneration [Abstract]	Abstract			ifrs-full:AuditorsRemunerationAbstract
197	Remuneration of Auditors	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfAuditorsRemunerationExplanatory
198	100250 - Disclosure - Commitments	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCommitments
199	Implied Table	Table	*	*	implied:Table
200	Disclosure Of Finance Lease And Operating Lease By Lessee [Abstract]	Abstract			ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeAbstract
201	Commitments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCommitmentsExplanatory
202	100260 - Disclosure - Contingent Liabilities	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureContingentLiabilities
203	Implied Table	Table	*	*	implied:Table
204	Disclosure Of Contingent Liabilities [Abstract]	Abstract			ifrs-full:DisclosureOfContingentLiabilitiesAbstract
205	Contingent Liabilities	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfContingentLiabilitiesExplanatory
206	100270 - Disclosure - Related Party Transactions	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRelatedPartyTransactions
207	Implied Table	Table	*	*	implied:Table
208	Disclosure Of Transactions Between Related Parties [Abstract]	Abstract			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
209	Related Party Transactions	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfRelatedPartyExplanatory
210	100280 - Disclosure - Parent Entity Information	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureParentEntityInformation
211	Implied Table	Table	*	*	implied:Table
212	Disclosure Of Parent Entity Information [Abstract]	Abstract			bntc:DisclosureOfParentEntityInformationAbstract
213	Parent Entity Information	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfConsolidatedAndSeparateFinancialStatementsExplanatory
214	100290 - Disclosure - Interests in Subsidiaries	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureInterestsInSubsidiaries
215	Implied Table	Table	*	*	implied:Table
216	Disclosure Of Significant Investments In Subsidiaries [Abstract]	Abstract			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesAbstract
217	Interests in Subsidiaries	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory
218	100300 - Disclosure - Events After the Reporting Period	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureEventsAfterReportingPeriod
219	Implied Table	Table	*	*	implied:Table
220	Disclosure Of Nonadjusting Events After Reporting Period [Abstract]	Abstract			ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract
221	Events After the Reporting Period	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
222	100310 - Disclosure - Reconciliation of Loss after Income Tax to Net Cash Used in Operating Activities	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivities
223	Implied Table	Table	*	*	implied:Table
224	Reconciliation Of Loss After Income Tax To Net Cash Used In Operating Activities [Abstract]	Abstract			bntc:ReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesAbstract
225	Reconciliation of Loss after Income Tax to Net Cash Used in Operating Activities	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCashFlowStatementExplanatory
226	100320 - Disclosure - Earnings Per Share	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureEarningsPerShare
227	Implied Table	Table	*	*	implied:Table
228	Earnings Per Share [Abstract]	Abstract			ifrs-full:EarningsPerShareAbstract
229	Earnings Per Share	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEarningsPerShareExplanatory
230	100330 - Disclosure - Share-based Payments	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureShareBasedPayments
231	Implied Table	Table	*	*	implied:Table
232	Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract]	Abstract			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
233	Share-based Payments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
234	100340 - Disclosure - Significant Accounting Policies (Policies)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureSignificantAccountingPoliciesPolicies
235	Implied Table	Table	*	*	implied:Table
236	Disclosure Of Significant Accounting Policies [Abstract]	Abstract			bntc:DisclosureOfSignificantAccountingPoliciesAbstract
237	Basis of preparation	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
238	New, revised or amending Accounting Standards and Interpretations adopted	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfInitialApplicationOfStandardsOrInterpretations
239	New Accounting Standards and Interpretations not yet mandatory or early adopted	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
240	Going concern	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfGoingConcernExplanatory
241	Parent entity information	Concept (Text Block (HTML))	For Period		bntc:DescriptionOfAccountingPolicyForParentEntityInformationExplanatory
242	Principles of consolidation	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfBasisOfConsolidationExplanatory
243	Operating segments	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
244	Foreign currency translation	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
245	Revenue recognition	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
246	Government research and development grants	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForGovernmentGrants
247	Income tax	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
248	Current and non-current classification	Concept (Text Block (HTML))	For Period		bntc:DescriptionOfAccountingPolicyForCurrentAndNonCurrentClassificationExplanatory
249	Cash and cash equivalents	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
250	Trade and other receivables	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory
251	Investments and other financial assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFinancialAssetsExplanatory
252	Plant and equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
253	Leases	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
254	Impairment of non-financial assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
255	Trade and other payables	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory
256	Employee benefits	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
257	Fair value measurement	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory
258	Issued capital	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
259	Earnings per share	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
260	Goods and Services Tax ('GST') and other similar taxes	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTaxesOtherThanIncomeTaxExplanatory
261	Rounding of amounts	Concept (Text Block (HTML))	For Period		bntc:DescriptionOfAccountingPolicyForRoundingOfAmountsExplanatory
262	100350 - Disclosure - Significant Accounting Policies (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureSignificantAccountingPoliciesTables
263	Implied Table	Table	*	*	implied:Table
264	Disclosure Of Significant Accounting Policies [Abstract]	Abstract			bntc:DisclosureOfSignificantAccountingPoliciesAbstract
265	Summary of Expected Useful Lives of Property, Plant and Equipment (Excluding Land)	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfExpectedUsefulLivesOfPropertyPlantAndEquipmentTextBlock
266	100360 - Disclosure - Operating Segments (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureOperatingSegmentsTables
267	Implied Table	Table	*	*	implied:Table
268	Disclosure Of Operating Segments [Abstract]	Abstract			ifrs-full:DisclosureOfOperatingSegmentsAbstract
269	Summary of Segment Revenues, Results or Assets by Geographical Location	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfGeographicalAreasExplanatory
270	100370 - Disclosure - Revenue and Other Income (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRevenueAndOtherIncomeTables
271	Implied Table	Table	*	*	implied:Table
272	Material Income And Expense [Abstract]	Abstract			ifrs-full:MaterialIncomeAndExpenseAbstract
273	Summary of Revenue	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfRevenueExplanatory
274	Summary of Other Income	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherOperatingIncomeExplanatory
275	100380 - Disclosure - Expenses (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureExpensesTables
276	Implied Table	Table	*	*	implied:Table
277	Material Income And Expense [Abstract]	Abstract			ifrs-full:MaterialIncomeAndExpenseAbstract
278	Summary of Expenses	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfExpensesByNatureExplanatory
279	100390 - Disclosure - Income Tax Benefit (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIncomeTaxBenefitTables
280	Implied Table	Table	*	*	implied:Table
281	Major Components Of Tax Expense Income [Abstract]	Abstract			ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
282	Summary of Income Tax Benefit and Reconciliation of Income Tax Benefit and Tax at the Statutory Rate	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfIncomeTaxBenefitAndReconciliationOfIncomeTaxBenefitAtStatutoryRateToActualIncomeTaxExpenseExplanatory
283	Summary of Tax Losses for Which No Deferred Tax Asset has been Recognised	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
284	100400 - Disclosure - Cash and Cash Equivalents (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCashAndCashEquivalentsTables
285	Implied Table	Table	*	*	implied:Table
286	Cash And Cash Equivalents [Abstract]	Abstract			ifrs-full:CashAndCashEquivalentsAbstract
287	Summary of Cash and Cash Equivalents	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutCashAndCashEquivalentsExplanatory
288	100410 - Disclosure - Other Financial Assets (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureOtherFinancialAssetsTables
289	Implied Table	Table	*	*	implied:Table
290	Disclosure Of Financial Assets [Abstract]	Abstract			ifrs-full:DisclosureOfFinancialAssetsAbstract
291	Summary of Other Financial Assets	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutOtherFinancialAssetsExplanatory
292	100420 - Disclosure - Trade and Other Receivables (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureTradeAndOtherReceivablesTables
293	Implied Table	Table	*	*	implied:Table
294	Trade And Other Receivables [Abstract]	Abstract			ifrs-full:TradeAndOtherReceivablesAbstract
295	Summary of Trade and Other Receivables	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesExplanatory
296	100430 - Disclosure - Current Assets - Other (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCurrentAssetsOtherTables
297	Implied Table	Table	*	*	implied:Table
298	Subclassifications Of Assets Liabilities And Equities [Abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
299	Summary of Current Assets - Other	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutOtherCurrentAssetsExplanatory
300	100440 - Disclosure - Deposits Non-current (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureDepositsNonCurrentTables
301	Implied Table	Table	*	*	implied:Table
302	Subclassifications Of Assets Liabilities And Equities [Abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
303	Summary of Deposits Non-current	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutLongtermDepositsExplanatory
304	100450 - Disclosure - Property, Plant and Equipment (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosurePropertyPlantAndEquipmentTables
305	Implied Table	Table	*	*	implied:Table
306	Disclosure Of Property Plant And Equipment [Abstract]	Abstract			ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
307	Summary of Property, Plant and Equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
308	Summary of Reconciliations of Property, Plant and Equipment	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfChangesInCarryingValueOfPropertyPlantAndEquipmentExplanatory
309	100460 - Disclosure - Trade and Other Payables (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureTradeAndOtherPayablesTables
310	Implied Table	Table	*	*	implied:Table
311	Trade And Other Payables [Abstract]	Abstract			ifrs-full:TradeAndOtherPayablesAbstract
312	Summary of Trade and Other Payables	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutTradeAndOtherPayablesExplanatory
313	100470 - Disclosure - Provisions (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureProvisionsTables
314	Implied Table	Table	*	*	implied:Table
315	Provisions [Abstract]	Abstract			ifrs-full:ProvisionsAbstract
316	Summary of Provisions	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutProvisionsExplanatory
317	100480 - Disclosure - Issued Capital (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIssuedCapitalTables
318	Implied Table	Table	*	*	implied:Table
319	Disclosure Of Classes Of Share Capital [Abstract]	Abstract			ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
320	Summary of Issued Capital	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
321	Summary of Movements in Ordinary Share Capital	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfMovementsInShareCapitalExplanatory
322	100490 - Disclosure - Reserves (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureReservesTables
323	Implied Table	Table	*	*	implied:Table
324	Disclosure Of Reserves Within Equity [Abstract]	Abstract			ifrs-full:DisclosureOfReservesWithinEquityAbstract
325	Summary of Reserves	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationOfReservesWithinEquityExplanatory
326	Summary of Movements in Each Class of Reserve	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfMovementsInReservesWithinEquityExplanatory
327	100500 - Disclosure - Accumulated Losses (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureAccumulatedLossesTables
328	Implied Table	Table	*	*	implied:Table
329	Retained Earnings [Abstract]	Abstract			bntc:RetainedEarningsAbstract
330	Summary of Accumulated Losses	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutRetainedEarningsExplanatory
331	100510 - Disclosure - Financial Instruments (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureFinancialInstrumentsTables
332	Disclosure Of Financial Instruments [Table]	Table	*	*	ifrs-full:DisclosureOfFinancialInstrumentsTable
333	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
334	Risks [member]	Member			ifrs-full:TypesOfRisksMember
335	Interest rate risk [member]	Member			ifrs-full:InterestRateRiskMember
336	Disclosure Of Financial Instruments [Line Items]	LineItems			ifrs-full:DisclosureOfFinancialInstrumentsLineItems
337	Summary of Financial Instruments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory
338	Summary of Variable Rate Cash and Cash Equivalents Outstanding	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory
339	Summary of Group's Remaining Contractual Maturity for its Financial Instrument Liabilities	Concept (Text Block (HTML))	For Period		ifrs-full:MaturityAnalysisForNonderivativeFinancialLiabilities
340	100520 - Disclosure - Remuneration of Auditors (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRemunerationOfAuditorsTables
341	Implied Table	Table	*	*	implied:Table
342	Auditors Remuneration [Abstract]	Abstract			ifrs-full:AuditorsRemunerationAbstract
343	Summary of Remuneration of Auditors	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutAuditorsRemunerationExplanatory
344	100530 - Disclosure - Commitments (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCommitmentsTables
345	Implied Table	Table	*	*	implied:Table
346	Disclosure Of Finance Lease And Operating Lease By Lessee [Abstract]	Abstract			ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeAbstract
347	Summary of Lease Commitments - Operating	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeExplanatory
348	100540 - Disclosure - Related Party Transactions (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRelatedPartyTransactionsTables
349	Implied Table	Table	*	*	implied:Table
350	Disclosure Of Transactions Between Related Parties [Abstract]	Abstract			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
351	Summary of Compensation of Key Management Personnel and Transactions with Related Parties	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfCompensationOfKeyManagementPersonnelAndTransactionsBetweenRelatedPartiesExplanatory
352	100550 - Disclosure - Parent Entity Information (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureParentEntityInformationTables
353	Implied Table	Table	*	*	implied:Table
354	Disclosure Of Parent Entity Information [Abstract]	Abstract			bntc:DisclosureOfParentEntityInformationAbstract
355	Summary of Parent Entity Information	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutConsolidatedAndSeparateFinancialStatementsExplanatory
356	100560 - Disclosure - Interests in Subsidiaries (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureInterestsInSubsidiariesTables
357	Implied Table	Table	*	*	implied:Table
358	Disclosure Of Significant Investments In Subsidiaries [Abstract]	Abstract			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesAbstract
359	Summary of Interests in Subsidiaries	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
360	100570 - Disclosure - Reconciliation of Loss after Income Tax to Net Cash Used in Operating Activities (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesTables
361	Implied Table	Table	*	*	implied:Table
362	Reconciliation Of Loss After Income Tax To Net Cash Used In Operating Activities [Abstract]	Abstract			bntc:ReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesAbstract
363	Summary of Reconciliation of Loss after Income Tax to Net Cash Used in Operating Activities	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailedInformationAboutCashFlowStatementExplanatory
364	100580 - Disclosure - Earnings Per Share (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureEarningsPerShareTables
365	Implied Table	Table	*	*	implied:Table
366	Earnings Per Share [Abstract]	Abstract			ifrs-full:EarningsPerShareAbstract
367	Summary of Earnings Per Share	Concept (Text Block (HTML))	For Period		ifrs-full:EarningsPerShareExplanatory
368	100590 - Disclosure - Share-based Payments (Tables)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureShareBasedPaymentsTables
369	Implied Table	Table	*	*	implied:Table
370	Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract]	Abstract			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
371	Summary of Number and Weighted Average Exercise Price of Share Options	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
372	Summary of Details of ESOP Share Options Outstanding	Concept (Text Block (HTML))	For Period		bntc:DisclosureOfDetailsOfShareOptionsByGrantDateExplanatory
373	Summary of Valuation Model Inputs used to Determine the Fair Value at the Grant Date	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory
374	100600 - Disclosure - Significant Accounting Policies - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetail
375	Disclosure Of Significant Accounting Policies [Table]	Table	*	*	bntc:DisclosureOfSignificantAccountingPoliciesTable
376	Legal Entity	Axis			dei:LegalEntityAxis
377	Entity	Member			dei:EntityDomain
378	Axovant Sciences [Member]	Member			bntc:AxovantSciencesMember
379	Non-adjusting events after reporting period [axis]	Axis			ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
380	Non-adjusting events after reporting period [member]	Member			ifrs-full:NonadjustingEventsMember
381	License Agreement and Fully Funded Collaboration [Member]	Member			bntc:LicenseAgreementAndFullyFundedResearchCollaborationMember
382	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
383	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
384	Tacere Therapeutics, Inc. [Member]	Member			bntc:TacereTherapeuticsIncMember
385	Disclosure of significant accounting policies [line items]	LineItems			bntc:DisclosureOfSignificantAccountingPoliciesLineItems
386	Upfront cash payment received	Concept (Monetary)	For Period	Credit	ifrs-full:LicenceFeeIncome
387	Net loss for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
388	Cash and cash equivalents balance	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
389	Ownership percentage in subsidiary	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInSubsidiary
390	Percentage of eligible research and development expenditures in which the government provides a cash refund	Concept (Percent)	For Period		bntc:PercentageOfEligibleResearchAndDevelopmentExpendituresInWhichGovernmentProvidesCashRefund
391	100610 - Disclosure - Significant Accounting Policies - Summary of Expected Useful Lives of Property, Plant and Equipment (Excluding Land) (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureSignificantAccountingPoliciesSummaryOfExpectedUsefulLivesOfPropertyPlantAndEquipmentExcludingLandDetail
392	Disclosure Of Property Plant And Equipment [Table]	Table	*	*	ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
393	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
394	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
395	Leasehold Improvements [Member]	Member			ifrs-full:LeaseholdImprovementsMember
396	Plant and Equipment [Member]	Member			bntc:PlantAndEquipmentMember
397	Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]	LineItems			ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
398	Description of expected useful lives of property, plant and equipment	Concept (Text/String)	For Period		ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
399	100620 - Disclosure - Critical Accounting Judgements, Estimates and Assumptions - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCriticalAccountingJudgementsEstimatesAndAssumptionsAdditionalInformationDetail
400	Implied Table	Table	*	*	implied:Table
401	Disclosure Of Changes In Accounting Estimates [Abstract]	Abstract			ifrs-full:DisclosureOfChangesInAccountingEstimatesAbstract
402	Grant Income includes an estimate of Research and Development grant receivable	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromGovernmentGrants
403	100630 - Disclosure - Operating Segments - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureOperatingSegmentsAdditionalInformationDetail
404	Implied Table	Table	*	*	implied:Table
405	Disclosure Of Operating Segments [Abstract]	Abstract			ifrs-full:DisclosureOfOperatingSegmentsAbstract
406	Number of operating segments	Concept (Integer)	For Period		bntc:NumberOfOperatingSegment
407	100640 - Disclosure - Operating Segments - Summary of Segment Revenues, Results or Assets by Geographical Location (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureOperatingSegmentsSummaryOfSegmentRevenuesResultsOrAssetsByGeographicalLocationDetail
408	Disclosure Of Geographical Areas [Table]	Table	*	*	ifrs-full:DisclosureOfGeographicalAreasTable
409	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
410	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
411	Australia [Member]	Member			country:AU
412	United States of America [Member]	Member			country:US
413	Disclosure Of Geographical Areas [Line Items]	LineItems			ifrs-full:DisclosureOfGeographicalAreasLineItems
414	Segment Revenues from External Customers	Concept (Monetary)	For Period	Credit	bntc:LicensingRevenueAndRoyalties
415	Segment Results	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
416	Carrying Amount of Segment Assets	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
417	100650 - Disclosure - Revenue and Other Income - Summary of Revenue (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRevenueAndOtherIncomeSummaryOfRevenueDetail
418	Implied Table	Table	*	*	implied:Table
419	Revenue [Abstract]	Abstract			ifrs-full:RevenueAbstract
420	Licensing revenue and royalties	Concept (Monetary)	For Period	Credit	bntc:LicensingRevenueAndRoyalties
421	Interest	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromInterest
422	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
423	100660 - Disclosure - Revenue and Other Income - Summary of Other Income (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRevenueAndOtherIncomeSummaryOfOtherIncomeDetail
424	Implied Table	Table	*	*	implied:Table
425	Material Income And Expense [Abstract]	Abstract			ifrs-full:MaterialIncomeAndExpenseAbstract
426	Australian Government R&D grants	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromGovernmentGrants
427	Foreign exchange unrealized gain	Concept (Monetary)	For Period	Credit	ifrs-full:NetForeignExchangeGain
428	Other	Concept (Monetary)	For Period	Credit	ifrs-full:MiscellaneousOtherOperatingIncome
429	Other income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherIncome
430	100670 - Disclosure - Expenses - Summary of Expenses (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureExpensesSummaryOfExpensesDetail
431	Disclosure Of Financial Instruments [Table]	Table	*	*	ifrs-full:DisclosureOfFinancialInstrumentsTable
432	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
433	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
434	Leasehold Improvements [Member]	Member			ifrs-full:LeaseholdImprovementsMember
435	Plant and Equipment [Member]	Member			bntc:PlantAndEquipmentMember
436	Disclosure Of Financial Instruments [Line Items]	LineItems			ifrs-full:DisclosureOfFinancialInstrumentsLineItems
437	Expenses	Abstract			ifrs-full:ExpenseByNatureAbstract
438	Depreciation	Abstract			ifrs-full:DepreciationAndAmortisationExpenseAbstract
439	Total depreciation	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationExpense
440	Research and development	Abstract			bntc:ResearchAndDevelopmentExpensesAbstract
441	Project expenses	Concept (Monetary)	For Period	Debit	bntc:ProjectExpenses
442	Other IP related expenses	Concept (Monetary)	For Period	Debit	bntc:OtherResearchAndDevelopmentExpense1
443	Total research and development	Concept (Monetary)	For Period	Debit	ifrs-full:ResearchAndDevelopmentExpense
444	Employee benefits expense	Abstract			ifrs-full:ClassesOfEmployeeBenefitsExpenseAbstract
445	Defined contribution superannuation expense	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
446	Employee benefits expense excluding superannuation	Concept (Monetary)	For Period	Debit	ifrs-full:OtherEmployeeExpense
447	Total employee benefits expense	Concept (Monetary)	For Period	Debit	ifrs-full:EmployeeBenefitsExpense
448	Rental expense relating to operating leases	Abstract			ifrs-full:LeaseAndSubleasePaymentsRecognisedAsExpenseAbstract
449	Minimum lease payments	Concept (Monetary)	For Period	Debit	ifrs-full:MinimumOperatingLeasePayments
450	100680 - Disclosure - Income Tax Benefit - Summary of Income Tax Benefit and Reconciliation of Income Tax Benefit and Tax at the Statutory Rate (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIncomeTaxBenefitSummaryOfIncomeTaxBenefitAndReconciliationOfIncomeTaxBenefitAndTaxAtStatutoryRateDetail
451	Implied Table	Table	*	*	implied:Table
452	Major Components Of Tax Expense Income [Abstract]	Abstract			ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
453	Income tax benefit	Abstract			ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract
454	Current tax	Concept (Monetary)	For Period	Debit	ifrs-full:CurrentTaxExpenseIncome
455	Income tax benefit	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
456	Numerical reconciliation of income tax benefit and tax at the statutory rate	Abstract			ifrs-full:ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract
457	Loss before income tax benefit	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
458	Tax at the statutory tax rate of 27.5% (2017:27.5%)(2016:30%)	Concept (Monetary)	For Period	Debit	ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
459	Tax effect amounts which are not deductible/(taxable) in calculating taxable income:	Abstract			bntc:TaxEffectAbstract
460	R&D expenses	Concept (Monetary)	For Period	Debit	bntc:TaxEffectOfResearchAndDevelopmentExpense
461	R&D incentive income	Concept (Monetary)	For Period	Credit	ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
462	Legal expenses	Concept (Monetary)	For Period	Debit	bntc:TaxEffectOfLegalExpenses
463	Share-based payments	Concept (Monetary)	For Period	Debit	bntc:TaxEffectOfSharebasedCompensation
464	Timing differences utilised not previously recognised	Concept (Monetary)	For Period	Credit	bntc:TaxEffectOfTimingDifferencesUtilisedNotPreviouslyRecognised
465	Write off prepayment	Concept (Monetary)	For Period	Debit	bntc:TaxEffectOfWriteOffPrepayment
466	Impact of foreign exchange rate differences	Concept (Monetary)	For Period	Credit	bntc:TaxEffectOfForeignExchangeRateDifferences
467	Tax effect of amounts which are not deductible/(taxable)	Concept (Monetary)	For Period	Debit	bntc:TaxEffectOfAmountsWhichAreNotDeductibleTaxable
468	Tax losses not brought to account	Concept (Monetary)	For Period	Debit	bntc:TaxLossesNotBroughtToAccount
469	Income tax benefit	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
470	100690 - Disclosure - Income Tax Benefit - Summary of Income Tax Benefit and Reconciliation of Income Tax Benefit and Tax at the Statutory Rate (Parenthetical) (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIncomeTaxBenefitSummaryOfIncomeTaxBenefitAndReconciliationOfIncomeTaxBenefitAndTaxAtStatutoryRateParentheticalDetail
471	Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Table]	Table	*	*	ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
472	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
473	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
474	Australia [Member]	Member			country:AU
475	Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]	LineItems			ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
476	Tax at the statutory tax percentage	Concept (Percent)	For Period		ifrs-full:ApplicableTaxRate
477	100700 - Disclosure - Income Tax Benefit - Summary of Tax Losses for Which No Deferred Tax Asset has been Recognised (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIncomeTaxBenefitSummaryOfTaxLossesForWhichNoDeferredTaxAssetHasBeenRecognisedDetail
478	Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Table]	Table	*	*	ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
479	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
480	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
481	Australia [Member]	Member			country:AU
482	United States of America [Member]	Member			country:US
483	Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]	LineItems			ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
484	Tax losses not recognised	Concept (Monetary)	As Of		ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
485	Capital losses not recognised	Concept (Monetary)	As Of	Debit	bntc:CapitalLossesForWhichNoDeferredTaxAssetRecognised
486	Other deferred tax assets not recognised	Concept (Monetary)	As Of	Debit	bntc:OtherDeferredTaxAssetNotRecognised
487	Tax losses for which no deferred tax asset has been recognised	Concept (Monetary)	As Of	Debit	bntc:TaxLossesForWhichNoDeferredTaxAssetRecognised
488	Potential tax benefit of tax assets not recognised	Concept (Monetary)	As Of	Debit	bntc:PotentialTaxBenefitOfTaxAssetsNotRecognised
489	100710 - Disclosure - Income Tax Benefit - Summary of Tax Losses for Which No Deferred Tax Asset has been Recognised (Parenthetical) (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIncomeTaxBenefitSummaryOfTaxLossesForWhichNoDeferredTaxAssetHasBeenRecognisedParentheticalDetail
490	Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Table]	Table	*	*	ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
491	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
492	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
493	Australia [Member]	Member			country:AU
494	United States of America [Member]	Member			country:US
495	Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]	LineItems			ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
496	Tax at the statutory tax percentage	Concept (Percent)	For Period		ifrs-full:ApplicableTaxRate
497	100720 - Disclosure - Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCashAndCashEquivalentsSummaryOfCashAndCashEquivalentsDetail
498	Implied Table	Table	*	*	implied:Table
499	Cash And Cash Equivalents [Abstract]	Abstract			ifrs-full:CashAndCashEquivalentsAbstract
500	Cash at bank	Concept (Monetary)	As Of	Debit	ifrs-full:BalancesWithBanks
501	Cash on deposit	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
502	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
503	100730 - Disclosure - Other Financial Assets - Summary of Other Financial Assets (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureOtherFinancialAssetsSummaryOfOtherFinancialAssetsDetail
504	Implied Table	Table	*	*	implied:Table
505	Categories Of Current Financial Assets [Abstract]	Abstract			ifrs-full:CategoriesOfCurrentFinancialAssetsAbstract
506	Market value of listed shares	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAvailableforsale
507	Security deposit	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents
508	Total other financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentFinancialAssets
509	100740 - Disclosure - Trade and Other Receivables - Summary of Trade and Other Receivables (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureTradeAndOtherReceivablesSummaryOfTradeAndOtherReceivablesDetail
510	Implied Table	Table	*	*	implied:Table
511	Trade And Other Current Receivables [Abstract]	Abstract			ifrs-full:TradeAndOtherCurrentReceivablesAbstract
512	Settlement Receivable	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTradeReceivables
513	R&D Grant Receivable	Concept (Monetary)	As Of	Debit	bntc:ResearchAndDevelopmentGrantReceivables
514	Other	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentReceivables
515	Total trade and other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivables
516	100750 - Disclosure - Current Assets - Other - Summary of Current Assets - Other (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCurrentAssetsOtherSummaryOfCurrentAssetsOtherDetail
517	Implied Table	Table	*	*	implied:Table
518	Miscellaneous Current Assets [Abstract]	Abstract			ifrs-full:MiscellaneousCurrentAssetsAbstract
519	Prepayments	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentPrepayments
520	Total Current Assets Other	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentNonfinancialAssets
521	100760 - Disclosure - Deposits Non - current - Summary of Deposits Non-current (Details)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureDepositsNonCurrentSummaryOfDepositsNonCurrentDetails
522	Implied Table	Table	*	*	implied:Table
523	Subclassifications Of Assets Liabilities And Equities [Abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
524	Other	Concept (Monetary)	As Of	Debit	bntc:OtherLongtermDeposits
525	Deposits	Concept (Monetary)	As Of	Debit	ifrs-full:LongtermDeposits
526	100770 - Disclosure - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosurePropertyPlantAndEquipmentSummaryOfPropertyPlantAndEquipmentDetail
527	Disclosure Of Property Plant And Equipment [Table]	Table	*	*	ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
528	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
529	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
530	Leasehold Improvements [Member]	Member			ifrs-full:LeaseholdImprovementsMember
531	Plant and Equipment [Member]	Member			bntc:PlantAndEquipmentMember
532	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
533	Carrying amount [member]	Member			ifrs-full:CarryingAmountMember
534	At Cost [Member]	Member			ifrs-full:GrossCarryingAmountMember
535	Accumulated Depreciation [Member]	Member			ifrs-full:AccumulatedDepreciationAndAmortisationMember
536	Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]	LineItems			ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
537	Plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
538	100780 - Disclosure - Property, Plant and Equipment - Summary of Reconciliations of Property, Plant and Equipment (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosurePropertyPlantAndEquipmentSummaryOfReconciliationsOfPropertyPlantAndEquipmentDetail
539	Disclosure Of Property Plant And Equipment [Table]	Table	*	*	ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
540	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
541	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
542	Leasehold Improvements [Member]	Member			ifrs-full:LeaseholdImprovementsMember
543	Plant and Equipment [Member]	Member			bntc:PlantAndEquipmentMember
544	Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]	LineItems			ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
545	Beginning balance	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
546	Additions	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
547	Disposals	Concept (Monetary)	For Period	Credit	ifrs-full:DisposalsPropertyPlantAndEquipment
548	Depreciation expense	Concept (Monetary)	For Period		ifrs-full:DepreciationPropertyPlantAndEquipment
549	FX loss	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
550	Ending balance	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
551	100790 - Disclosure - Trade and Other Payables - Summary of Trade and Other Payables (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureTradeAndOtherPayablesSummaryOfTradeAndOtherPayablesDetail
552	Implied Table	Table	*	*	implied:Table
553	Trade And Other Payables [Abstract]	Abstract			ifrs-full:TradeAndOtherPayablesAbstract
554	Trade creditors	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
555	Sundry creditors and accrued expenses	Concept (Monetary)	As Of	Credit	bntc:CurrentSundryCreditorsAndAccruedExpenses
556	Total trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
557	100800 - Disclosure - Provisions - Summary of Provisions (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureProvisionsSummaryOfProvisionsDetail
558	Implied Table	Table	*	*	implied:Table
559	Provisions [Abstract]	Abstract			ifrs-full:ProvisionsAbstract
560	Employee Benefits	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentProvisionsForEmployeeBenefits
561	Provision for make good	Concept (Monetary)	As Of	Credit	ifrs-full:OtherShorttermProvisions
562	Total provisions	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentProvisions
563	100810 - Disclosure - Issued Capital - Summary of Issued Capital (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIssuedCapitalSummaryOfIssuedCapitalDetail
564	Implied Table	Table	*	*	implied:Table
565	Disclosure Of Classes Of Share Capital [Abstract]	Abstract			ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
566	Ordinary shares - fully paid, shares	Concept (Shares)	As Of		ifrs-full:NumberOfSharesIssuedAndFullyPaid
567	Ordinary shares - fully paid	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
568	100820 - Disclosure - Issued Capital - Summary of Movements in Ordinary Share Capital (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIssuedCapitalSummaryOfMovementsInOrdinaryShareCapitalDetail
569	Disclosure Of Classes Of Share Capital [Table]	Table	*	*	ifrs-full:DisclosureOfClassesOfShareCapitalTable
570	Classes of ordinary shares [axis]	Axis			ifrs-full:ClassesOfOrdinarySharesAxis
571	Ordinary shares [member]	Member			ifrs-full:OrdinarySharesMember
572	Issue of Shares Highbridge [Member]	Member			bntc:HighbridgeCapitalManagementLLCMember
573	Issue of Shares Nant Capital [Member]	Member			bntc:NantCapitalLLCMember
574	Issue of Shares Entitlement Offer [Member]	Member			bntc:EntitlementOfferMember
575	Disclosure Of Classes Of Share Capital [Line Items]	LineItems			ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
576	Date	Concept (Date)	For Period		bntc:SharesIssuanceDate
577	Issue price	Concept (Share)	For Period		bntc:SharesIssuancePricePerShare
578	Beginning balance, shares	Concept (Shares)	As Of		ifrs-full:NumberOfSharesIssuedAndFullyPaid
579	Issue of shares	Concept (Shares)	For Period		ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
580	Ending balance, shares	Concept (Shares)	As Of		ifrs-full:NumberOfSharesIssuedAndFullyPaid
581	The weighted average number of shares on issue during the twelve months to June 30, 2018 was	Concept (Shares)	For Period		ifrs-full:WeightedAverageShares
582	Beginning balance, value	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
583	Contributions of equity, net of transaction costs	Concept (Monetary)	For Period	Credit	ifrs-full:IssueOfEquity
584	IPO and share issue transaction cost	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsForShareIssueCosts
585	Ending balance, value	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
586	100830 - Disclosure - Issued Capital - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureIssuedCapitalAdditionalInformationDetail
587	Disclosure Of Classes Of Share Capital [Table]	Table	*	*	ifrs-full:DisclosureOfClassesOfShareCapitalTable
588	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
589	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
590	Ordinary shares [member]	Member			ifrs-full:OrdinarySharesMember
591	Disclosure Of Classes Of Share Capital [Line Items]	LineItems			ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
592	Par value per share	Concept (Share)	As Of		ifrs-full:ParValuePerShare
593	Number of vote per share	Concept (Integer)	As Of		bntc:NumberOfVoteForEachShare
594	Number of ordinary shares represented by 1 ADR	Concept (Shares)	As Of		bntc:NumberOfOrdinarySharesRepresentedBy1ADR
595	100840 - Disclosure - Reserves - Summary of Reserves (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureReservesSummaryOfReservesDetail
596	Implied Table	Table	*	*	implied:Table
597	Disclosure Of Reserves Within Equity [Abstract]	Abstract			ifrs-full:DisclosureOfReservesWithinEquityAbstract
598	Foreign currency reserve	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfExchangeDifferencesOnTranslation
599	Share-based payments reserve	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfSharebasedPayments
600	Reserves	Concept (Monetary)	As Of	Credit	ifrs-full:OtherReserves
601	100850 - Disclosure - Reserves - Summary of Movements in Each Class of Reserve (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureReservesSummaryOfMovementsInEachClassOfReserveDetail
602	Disclosure Of Reserves Within Equity [Table]	Table	*	*	ifrs-full:DisclosureOfReservesWithinEquityTable
603	Reserves within equity [axis]	Axis			ifrs-full:ReservesWithinEquityAxis
604	Reserves [Member]	Member			ifrs-full:OtherReservesMember
605	Foreign Currency Reserve [Member]	Member			ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
606	Share-based Payments Reserve [Member]	Member			ifrs-full:ReserveOfSharebasedPaymentsMember
607	Disclosure Of Reserves Within Equity [Line Items]	LineItems			ifrs-full:DisclosureOfReservesWithinEquityLineItems
608	Beginning balance	Concept (Monetary)	As Of	Credit	ifrs-full:OtherReserves
609	Foreign currency translation loss	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
610	Share-based payments	Concept (Monetary)	For Period	Credit	bntc:IncreaseDecreaseThroughShareBasedPaymentTransactionsOtherReserves
611	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:OtherReserves
612	100860 - Disclosure - Accumulated Losses - Summary of Accumulated Losses (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureAccumulatedLossesSummaryOfAccumulatedLossesDetail
613	Statement Of Changes In Equity [Table]	Table	*	*	ifrs-full:StatementOfChangesInEquityTable
614	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
615	Equity [member]	Member			ifrs-full:EquityMember
616	Accumulated Losses [Member]	Member			ifrs-full:RetainedEarningsMember
617	Statement Of Changes In Equity [Line Items]	LineItems			ifrs-full:StatementOfChangesInEquityLineItems
618	Beginning balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
619	Loss after income tax benefit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
620	Transfer from share-based payment reserve for expired options	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughTransferBetweenRevaluationReserveAndRetainedEarnings
621	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
622	100870 - Disclosure - Dividends - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureDividendsAdditionalInformationDetail
623	Implied Table	Table	*	*	implied:Table
624	Disclosure Of Dividends [Abstract]	Abstract			bntc:DisclosureOfDividendsAbstract
625	Dividends paid	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsPaid
626	100880 - Disclosure - Financial Instruments - Summary of Financial Instruments (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfFinancialInstrumentsDetail
627	Implied Table	Table	*	*	implied:Table
628	Disclosure Of Financial Instruments [Abstract]	Abstract			ifrs-full:DisclosureOfFinancialInstrumentsAbstract
629	Financial Assets	Abstract			ifrs-full:DisclosureOfFinancialAssetsAbstract
630	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
631	Trade and other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivables
632	Total Financial Assets	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
633	Financial Liabilities	Abstract			ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
634	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
635	Total Financial Liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilities
636	100890 - Disclosure - Financial Instruments - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureFinancialInstrumentsAdditionalInformationDetail
637	Disclosure Of Risk Management Strategy Related To Hedge Accounting [Table]	Table	*	*	ifrs-full:DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable
638	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
639	Risks [member]	Member			ifrs-full:TypesOfRisksMember
640	Currency risk [member]	Member			ifrs-full:CurrencyRiskMember
641	Currency	Axis			us-gaap:CurrencyAxis
642	All Currencies	Member			currency:AllCurrenciesDomain
643	United States of America, Dollars	Member			currency:USD
644	Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]	LineItems			ifrs-full:DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems
645	Cash or cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
646	Trade payables and accruals	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
647	Net USD exposure	Concept (Monetary)	As Of		ifrs-full:RiskExposureAssociatedWithInstrumentsSharingCharacteristic
648	Potential movement in exchange rate	Concept (Monetary)	For Period	Credit	bntc:ConcentrationOfRiskChangeInExchangeRate
649	Increase (decrease) in profit loss and net assets due to potential movement in exchange rate	Concept (Monetary)	For Period	Credit	bntc:IncreaseDecreaseInProfitLossAndNetAssetsDueToPotentialMovementInExchangeRate
650	100900 - Disclosure - Financial Instruments - Summary of Variable Rate Cash and Cash Equivalents Outstanding (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfVariableRateCashAndCashEquivalentsOutstandingDetail
651	Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments [Table]	Table	*	*	ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
652	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
653	Risks [member]	Member			ifrs-full:TypesOfRisksMember
654	Interest rate risk [member]	Member			ifrs-full:InterestRateRiskMember
655	Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments [Line Items]	LineItems			ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
656	Weighted average interest rate	Concept (Percent)	As Of		bntc:WeightedAverageInterestRate
657	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
658	Net exposure to cash flow interest rate risk	Concept (Monetary)	As Of		ifrs-full:RiskExposureAssociatedWithInstrumentsSharingCharacteristic
659	100910 - Disclosure - Financial Instruments - Summary of Group's Remaining Contractual Maturity for its Financial Instrument Liabilities (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfGroupSRemainingContractualMaturityForItsFinancialInstrumentLiabilitiesDetail
660	Disclosure Of Maturity Analysis For Nonderivative Financial Liabilities [Table]	Table	*	*	ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable
661	Classes of financial liabilities [axis]	Axis			ifrs-full:ClassesOfFinancialLiabilitiesAxis
662	Financial liabilities, class [member]	Member			ifrs-full:FinancialLiabilitiesMember
663	Trade Payables [Member]	Member			bntc:TradePayablesMember
664	Other Payables [Member]	Member			bntc:OtherPayablesMember
665	Maturity [axis]	Axis			ifrs-full:MaturityAxis
666	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
667	1 Year or Less [Member]	Member			ifrs-full:NotLaterThanOneYearMember
668	Between 1 and 2 Years [Member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
669	Between 2 and 5 Years [Member]	Member			ifrs-full:LaterThanTwoYearsAndNotLaterThanFiveYearsMember
670	Over 5 Years [Member]	Member			ifrs-full:LaterThanFiveYearsMember
671	Disclosure Of Maturity Analysis For Nonderivative Financial Liabilities [Line Items]	LineItems			ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems
672	Weighted average interest rate	Concept (Percent)	As Of		bntc:WeightedAverageInterestRate
673	Trade payables	Concept (Monetary)	As Of	Credit	bntc:TradePayablesUndiscountedCashFlows
674	Other payables	Concept (Monetary)	As Of	Credit	bntc:OtherPayablesUndiscountedCashFlows
675	Total non-derivatives	Concept (Monetary)	As Of	Credit	ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
676	100920 - Disclosure - Remuneration of Auditors - Summary of Remuneration of Auditors (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRemunerationOfAuditorsSummaryOfRemunerationOfAuditorsDetail
677	Auditors Remuneration [Table]	Table	*	*	bntc:AuditorsRemunerationTable
678	Types of contracts [axis]	Axis			ifrs-full:TypesOfContractsAxis
679	Types of contracts [member]	Member			ifrs-full:TypesOfContractsMember
680	F1 Consent [Member]	Member			bntc:FOneConsentMember
681	F3 Consent [Member]	Member			bntc:FThreeConsentMember
682	Auditors Remuneration [Line Items]	LineItems			bntc:AuditorsRemunerationLineItems
683	Audit or review of the financial statements	Concept (Monetary)	For Period	Debit	ifrs-full:AuditorsRemunerationForAuditServices
684	Other audit services	Concept (Monetary)	For Period	Debit	bntc:AuditorsRemunerationForOtherAuditServices
685	Tax compliance services	Concept (Monetary)	For Period	Debit	ifrs-full:AuditorsRemunerationForTaxServices
686	Other services	Concept (Monetary)	For Period	Debit	ifrs-full:AuditorsRemunerationForOtherServices
687	Remuneration of auditors	Concept (Monetary)	For Period	Debit	ifrs-full:AuditorsRemuneration
688	100930 - Disclosure - Commitments - Summary of Lease Commitments - Operating (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCommitmentsSummaryOfLeaseCommitmentsOperatingDetail
689	Disclosure Of Finance Lease And Operating Lease By Lessee [Table]	Table	*	*	ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
690	Maturity [axis]	Axis			ifrs-full:MaturityAxis
691	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
692	Within One Year [Member]	Member			ifrs-full:NotLaterThanOneYearMember
693	One to Five Years [Member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
694	Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]	LineItems			ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
695	Lease commitments - operating	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
696	100940 - Disclosure - Commitments - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetail
697	Implied Table	Table	*	*	implied:Table
698	Disclosure Of Finance Lease And Operating Lease By Lessee [Abstract]	Abstract			ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeAbstract
699	Expiring period of operating lease commitments	Concept (xbrli:durationItemType)	For Period		bntc:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLeaseTerm
700	100950 - Disclosure - Contingent Liabilities - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureContingentLiabilitiesAdditionalInformationDetail
701	Disclosure Of Contingent Liabilities [Table]	Table	*	*	ifrs-full:DisclosureOfContingentLiabilitiesTable
702	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
703	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
704	NantWorks LLC [Member]	Member			bntc:NantWorksLLCMember
705	Oxford Expression Technologies (OET) [Member]	Member			bntc:OxfordExpressionTechnologiesMember
706	Classes of contingent liabilities [axis]	Axis			ifrs-full:ClassesOfContingentLiabilitiesAxis
707	Contingent liabilities [member]	Member			ifrs-full:ContingentLiabilitiesMember
708	Milestone Payment Contingent Liability [Member]	Member			bntc:MilestonePaymentContingentLiabilityMember
709	Disclosure of contingent liabilities [Line Items]	LineItems			ifrs-full:DisclosureOfContingentLiabilitiesLineItems
710	Amount of milestone payment	Concept (Monetary)	As Of		ifrs-full:EstimatedFinancialEffectOfContingentLiabilities
711	100960 - Disclosure - Related Party Transactions - Summary of Compensation of Key Management Personnel and Transactions with Related Parties (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRelatedPartyTransactionsSummaryOfCompensationOfKeyManagementPersonnelAndTransactionsWithRelatedPartiesDetail
712	Disclosure Of Transactions Between Related Parties [Table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
713	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
714	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
715	Francis Abourizk Lightowlers [Member]	Member			bntc:FrancisAbourizkLightowlersMember
716	NewStar Ventures Ltd [Member]	Member			bntc:NewstarVenturesLtdMember
717	Annabel West [Member]	Member			bntc:AnnabelWestMember
718	Disclosure Of Transactions Between Related Parties [Line Items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
719	Short-term employee benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
720	Post-employment benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
721	Long-term benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationOtherLongtermBenefits
722	Share-based payments	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
723	Key management personnel compensation	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensation
724	Legal services paid / payable to Francis Abourizk Lightowlers, a law firm in which Mr Peter Francis is a partner and has a beneficial interest.	Concept (Monetary)	For Period	Debit	ifrs-full:ServicesExpense
725	Payment for rent at Francis Abourizk Lightowlers law firm which Mr Peter Francis is a partner and has a beneficial interest	Concept (Monetary)	For Period	Debit	ifrs-full:RentalExpense
726	Consultancy fees for executive duties paid/payable to NewStar Ventures Ltd, a corporation in which Dr John Chiplin is a director and has a beneficial interest.	Concept (Monetary)	For Period	Debit	bntc:ConsultancyFees
727	Annabel West, the wife of Greg West, our former Chief Executive Officer, was employed as a part-time clerical and administrative assistant.	Concept (Monetary)	For Period	Debit	ifrs-full:AdministrativeExpense
728	100970 - Disclosure - Related Party Transactions - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetail
729	Implied Table	Table	*	*	implied:Table
730	Disclosure Of Transactions Between Related Parties [Abstract]	Abstract			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
731	Trade receivable from related party	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherReceivablesDueFromRelatedParties
732	Trade payments to related party	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesToRelatedParties
733	Loans to related party	Concept (Monetary)	As Of	Debit	bntc:LoansReceivableRelatedPartyTransactions
734	Loans from related party	Concept (Monetary)	As Of	Credit	bntc:LoansPayableRelatedPartyTransactions
735	100980 - Disclosure - Parent Entity Information - Summary of Parent Entity Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureParentEntityInformationSummaryOfParentEntityInformationDetail
736	Disclosure Of Transactions Between Related Parties [Table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
737	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
738	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
739	Parent [Member]	Member			ifrs-full:ParentMember
740	Disclosure Of Transactions Between Related Parties [Line Items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
741	Statement of profit or loss and other comprehensive income	Abstract			ifrs-full:StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract
742	Loss after income tax benefit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
743	Total comprehensive income	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
744	Statement of financial position	Abstract			ifrs-full:StatementOfFinancialPositionAbstract
745	Total current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
746	Total assets	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
747	Total current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
748	Total liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:Liabilities
749	EQUITY	Abstract			ifrs-full:EquityAbstract
750	Issued capital	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
751	Share-based payments reserve	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfSharebasedPayments
752	Accumulated losses	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
753	TOTAL EQUITY	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
754	100990 - Disclosure - Parent Entity Information - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureParentEntityInformationAdditionalInformationDetail
755	Disclosure Of Transactions Between Related Parties [Table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
756	Legal Entity	Axis			dei:LegalEntityAxis
757	Entity	Member			dei:EntityDomain
758	Parent [Member]	Member			ifrs-full:ParentMember
759	Disclosure Of Transactions Between Related Parties [Line Items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
760	Guarantees in relation to the debts of its subsidiaries	Concept (Monetary)	For Period		ifrs-full:ProvisionOfGuaranteesOrCollateralByEntityRelatedPartyTransactions
761	Contingent liabilities	Concept (Monetary)	As Of		ifrs-full:EstimatedFinancialEffectOfContingentLiabilities
762	Capital commitments for property, plant and equipment	Concept (Monetary)	As Of	Credit	ifrs-full:ContractualCommitmentsForAcquisitionOfPropertyPlantAndEquipment
763	101000 - Disclosure - Interests in Subsidiaries - Summary of Interests in Subsidiaries (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureInterestsInSubsidiariesSummaryOfInterestsInSubsidiariesDetail
764	Disclosure Of Significant Investments In Subsidiaries [Table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
765	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
766	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
767	Benitec Limited [Member]	Member			bntc:BenitecLimitedMember
768	Benitec Australia Limited [Member]	Member			bntc:BenitecAustraliaLimitedMember
769	Benitec, Inc. [Member]	Member			bntc:BenitecIncMember
770	Benitec LLC [Member]	Member			bntc:BenitecLlcMember
771	RNAi Therapeutics, Inc. [Member]	Member			bntc:RnaiTherapeuticsIncMember
772	Tacere Therapeutics, Inc. [Member]	Member			bntc:TacereTherapeuticsIncMember
773	Disclosure Of Significant Investments In Subsidiaries [Line Items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
774	Name of subsidiary	Concept (Text/String)	For Period		ifrs-full:NameOfSubsidiary
775	Principal place of business	Concept (Text/String)	For Period		ifrs-full:PrincipalPlaceOfBusinessOfSubsidiary
776	Country of incorporation	Concept (Text/String)	For Period		ifrs-full:CountryOfIncorporationOrResidenceOfSubsidiary
777	Ownership percentage in subsidiary	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInSubsidiary
778	101010 - Disclosure - Events After the Reporting Period - Additional Information (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureEventsAfterReportingPeriodAdditionalInformationDetail
779	Disclosure Of Nonadjusting Events After Reporting Period [Table]	Table	*	*	ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodTable
780	Legal Entity	Axis			dei:LegalEntityAxis
781	Entity	Member			dei:EntityDomain
782	Axovant Sciences [Member]	Member			bntc:AxovantSciencesMember
783	Non-adjusting events after reporting period [axis]	Axis			ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
784	Non-adjusting events after reporting period [member]	Member			ifrs-full:NonadjustingEventsMember
785	License Agreement and Fully Funded Collaboration [Member]	Member			bntc:LicenseAgreementAndFullyFundedResearchCollaborationMember
786	Disclosure of non-adjusting events after reporting period [Line Items]	LineItems			ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
787	Number of additional products	Concept (Integer)	For Period		bntc:NumberOfAdditionalProducts
788	Upfront cash payment received	Concept (Monetary)	For Period	Credit	ifrs-full:LicenceFeeIncome
789	Additional cash payment	Concept (Monetary)	As Of		ifrs-full:EstimatedFinancialEffectOfContingentAssets
790	Number of milestones achievable	Concept (Integer)	For Period		bntc:NumberOfMilestonesAchievable
791	Number of near term milestones achievable	Concept (Integer)	For Period		bntc:NumberOfNearTermMilestonesAchievable
792	Maximum amount realizable upon completion of milestones	Concept (Monetary)	As Of	Debit	bntc:MaximumAmountRealizableUponCompletionOfMilestones
793	Percentage of net profit on sales	Concept (Percent)	For Period		bntc:PercentageOfEntitysNetProfitOnSales
794	101020 - Disclosure - Reconciliation of Loss after Income Tax to Net Cash Used in Operating Activities - Summary of Reconciliation of Loss after income Tax to Net Cash Used in Operating Activities (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesSummaryOfReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesDetail
795	Implied Table	Table	*	*	implied:Table
796	Reconciliation Of Loss After Income Tax To Net Cash Used In Operating Activities [Abstract]	Abstract			bntc:ReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesAbstract
797	Loss after income tax benefit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
798	Adjustments for:	Abstract			ifrs-full:AdjustmentsForReconcileProfitLossAbstract
799	Loss on disposal of fixed assets	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets
800	Depreciation and amortisation	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
801	Share-based payments	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
802	Net unrealised Foreign exchange	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
803	Issue of ordinary shares to Biomics	Concept (Monetary)	For Period	Debit	bntc:AdjustmentsForIssueOfOrdinaryShares
804	Impairment of prepayment	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossRecognisedInProfitOrLoss
805	Change in operating assets and liabilities:	Abstract			bntc:ChangeInOperatingAssetsAndLiabilitiesAbstract
806	Increase in trade and other receivables	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
807	(Decrease) in other current assets	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDecreaseIncreaseInOtherCurrentAssets
808	Increase in trade and other payables	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
809	(Decrease) in R&D grant receivable	Concept (Monetary)	For Period	Debit	bntc:AdjustmentsForIncreaseDecreaseInResearchAndDevelopmentGrantReceivable
810	(Decrease) in employee benefits	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities
811	Increase in provision	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForProvisions
812	Net cash used in operating activities	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperatingActivities
813	101030 - Disclosure - Earnings Per Share - Summary of Earnings Per Share (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureEarningsPerShareSummaryOfEarningsPerShareDetail
814	Implied Table	Table	*	*	implied:Table
815	Earnings Per Share [Abstract]	Abstract			ifrs-full:EarningsPerShareAbstract
816	Loss after income tax attributable to the owners of Benitec Biopharma Limited	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
817	Weighted average number of ordinary shares used in calculating basic earnings per share	Concept (Shares)	For Period		ifrs-full:WeightedAverageShares
818	Weighted average number of ordinary shares used in calculating diluted earnings per share	Concept (Shares)	For Period		ifrs-full:AdjustedWeightedAverageShares
819	Basic (loss) per share	Concept (Share)	For Period		ifrs-full:BasicEarningsLossPerShare
820	Diluted (loss) per share	Concept (Share)	For Period		ifrs-full:DilutedEarningsLossPerShare
821	101040 - Disclosure - Share-based Payments - Summary of Number and Weighted Average Exercise Price of Share Options (Detail)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureShareBasedPaymentsSummaryOfNumberAndWeightedAverageExercisePriceOfShareOptionsDetail
822	Implied Table	Table	*	*	implied:Table
823	Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract]	Abstract			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
824	Number of shares, Outstanding at the beginning of the year	Concept (Decimal)	As Of		ifrs-full:NumberOfOutstandingShareOptions
825	Number of shares, Granted during the year	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
826	Number of shares, Exercised during the year	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
827	Number of shares, Lapsed or forfeited during the year	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
828	Number of shares, Outstanding at the end of the year	Concept (Decimal)	As Of		ifrs-full:NumberOfOutstandingShareOptions
829	Number of shares, Options exercisable at the end of the year	Concept (Decimal)	As Of		ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
830	Weighted average exercise price, Outstanding at the beginning of the year	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
831	Weighted average exercise price, Granted during the year	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
832	Weighted average exercise price, Exercised during the year	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
833	Weighted average exercise price, Lapsed or forfeited during the year	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
834	Weighted average exercise price, Outstanding at the end of the year	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
835	Weighted average exercise price, Options exercisable at the end of the year	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
836	101050 - Disclosure - Share-based Payments - Summary of Details of ESOP Share Options Outstanding (Details)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureShareBasedPaymentsSummaryOfDetailsOfESOPShareOptionsOutstandingDetails
837	Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Table]	Table	*	*	ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable
838	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
839	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
840	Employee Stock Ownership Plan [Member]	Member			bntc:EmployeeStockOwnershipPlanMember
841	Non-Executive Directors Options [Member]	Member			bntc:NonExecutiveDirectorsOptionsMember
842	Range [axis]	Axis			ifrs-full:RangeAxis
843	Ranges [member]	Member			ifrs-full:RangesMember
844	September 26, 2011	Member			bntc:GrantDateOneMember
845	November 17, 2012	Member			bntc:GrantDateTwoMember
846	February 7, 2012	Member			bntc:GrantDateThreeMember
847	November 6, 2012	Member			bntc:GrantDateFourMember
848	November 10, 2013	Member			bntc:GrantDateFiveMember
849	August 22, 2013	Member			bntc:GrantDateSixMember
850	May 15, 2014	Member			bntc:GrantDateSevenMember
851	December 17, 2014	Member			bntc:GrantDateEightMember
852	May 6, 2015	Member			bntc:GrantDateNineAMember
853	November 12, 2015	Member			bntc:GrantDateTenMember
854	August 9, 2016	Member			bntc:GrantDateElevenMember
855	July 17, 2017	Member			bntc:GrantDateTwelveMember
856	April 11, 2018	Member			bntc:GrantDateThirteenMember
857	June 26, 2018	Member			bntc:GrantDateFourteenMember
858	Bottom Of Range [Member]	Member			ifrs-full:BottomOfRangeMember
859	Top Of Range [Member]	Member			ifrs-full:TopOfRangeMember
860	Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Line Items]	LineItems			ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems
861	Grant date	Concept (Text/String)	For Period		ifrs-full:DateOfGrantOfSharebasedPaymentArrangement
862	Expiry date	Concept (Date)	For Period		bntc:DateOfExpiryOfShareBasedPaymentArrangement
863	Exercise price	Concept (Monetary)	For Period		ifrs-full:ExercisePriceShareOptionsGranted
864	Number of option	Concept (Decimal)	As Of		ifrs-full:NumberOfOutstandingShareOptions
865	101060 - Disclosure - Share-based Payments - Additional Information (Details)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureShareBasedPaymentsAdditionalInformationDetails
866	Implied Table	Table	*	*	implied:Table
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868	Weighted average remaining life of options	Concept (Decimal)	As Of		ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
869	Expenses arising from share-based payment transactions recognized during the period	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
870	101070 - Disclosure - Share-based Payments - Summary of Valuation Model Inputs used to Determine the Fair Value at the Grant Date (Details)	Network	*	*	http://benitec.com/20180630/taxonomy/role/DisclosureShareBasedPaymentsSummaryOfValuationModelInputsUsedToDetermineFairValueAtGrantDateDetails
871	Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]	Table	*	*	ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
872	Range [axis]	Axis			ifrs-full:RangeAxis
873	Ranges [member]	Member			ifrs-full:RangesMember
874	17/07/2017	Member			bntc:GrantDateTwelveMember
875	11/04/2018	Member			bntc:GrantDateThirteenMember
876	26/06/2018	Member			bntc:GrantDateFourteenMember
877	Bottom Of Range [Member]	Member			ifrs-full:BottomOfRangeMember
878	Top Of Range [Member]	Member			ifrs-full:TopOfRangeMember
879	Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]	LineItems			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
880	Grant date	Concept (Text/String)	For Period		ifrs-full:DateOfGrantOfSharebasedPaymentArrangement
881	Expiry date	Concept (Date)	For Period		bntc:DateOfExpiryOfShareBasedPaymentArrangement
882	Share price at grant date	Concept (Share)	For Period		bntc:SharePrice1
883	Exercise price	Concept (Monetary)	For Period		ifrs-full:ExercisePriceShareOptionsGranted
884	Expected volatility	Concept (Percent)	For Period		ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
885	Dividend yield	Concept (Percent)	For Period		ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
886	Risk-free interest rate	Concept (Percent)	For Period		ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
887	Fair value at grant date	Concept (Monetary)	As Of	Credit	ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted