cm:Concept: us-gaap:ContractualObligationDueInFourthAndFifthYear
| Contractual Obligation, Due in Fourth and Fifth Year |
| us-gaap:ContractualObligationDueInFourthAndFifthYear |
| Amount of contractual obligation due in the fourth and fifth fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:ContractualObligationDueInFourthAndFifthYear |