cm:Concept: us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableDueInRollingAfterYearFive
| Capital Leases, Future Minimum Payments Receivable, Rolling after Year Five |
| us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableDueInRollingAfterYearFive |
| Amount of minimum lease payments to be received by the lessor for capital leases after the fifth rolling twelve months following the latest balance sheet. For 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) |
| Debit |
| false |
| us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableDueInRollingAfterYearFive |