cm:Concept: us-gaap:RevenuePracticalExpedientRemainingPerformanceObligation
| Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] |
| us-gaap:RevenuePracticalExpedientRemainingPerformanceObligation |
| Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenuePracticalExpedientRemainingPerformanceObligation |