cm:Concept: us-gaap:RevenuePracticalExpedientInitialApplicationAndTransitionNonrestatementOfModifiedContract
| Revenue, Practical Expedient, Initial Application and Transition, Nonrestatement of Modified Contract [true false] |
| us-gaap:RevenuePracticalExpedientInitialApplicationAndTransitionNonrestatementOfModifiedContract |
| Indicates (true false) whether practical expedient was elected under initial application of retrospective method to aggregate effect of contract modified before beginning of earliest period presented when identifying satisfied and unsatisfied performance obligation, determining transaction price and allocating transaction price to performance obligation. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenuePracticalExpedientInitialApplicationAndTransitionNonrestatementOfModifiedContract |