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