cm:Concept: us-gaap:DeferredCompensationCashBasedArrangementsLiabilityCurrent
| Deferred Compensation Cash-based Arrangements, Liability, Current |
| us-gaap:DeferredCompensationCashBasedArrangementsLiabilityCurrent |
| Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable within one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:DeferredCompensationCashBasedArrangementsLiabilityCurrent |