cm:Concept: us-gaap:RevenueRecognitionMultipleDeliverableArrangementsAllocationToSpecificUnitOfAccountingEffectOfChangesAssumptions
| Revenue Recognition, Multiple-deliverable Arrangements, Allocation to Specific Unit of Accounting, Effect of Changes, Assumptions |
| us-gaap:RevenueRecognitionMultipleDeliverableArrangementsAllocationToSpecificUnitOfAccountingEffectOfChangesAssumptions |
| Describes the effect of changes to the assumptions used (for example, inputs, comparables, criteria) for allocating consideration to a specific unit of accounting in a multiple-deliverable arrangement. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenueRecognitionMultipleDeliverableArrangementsAllocationToSpecificUnitOfAccountingEffectOfChangesAssumptions |