cm:Concept: us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent
| Business Combination, Contingent Consideration, Liability, Noncurrent |
| us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent |
| Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent |