cm:Concept: us-gaap:PaymentForContingentConsiderationLiabilityOperatingActivities
| Payment for Contingent Consideration Liability, Operating Activities |
| us-gaap:PaymentForContingentConsiderationLiabilityOperatingActivities |
| Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability exceeding amount recognized at acquisition date. Includes, but is not limited to, measurement period adjustment and less amount paid soon after acquisition date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:PaymentForContingentConsiderationLiabilityOperatingActivities |