cm:Concept: us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableNextRollingTwelveMonths
| Capital Leases, Future Minimum Payments Receivable, Next Rolling Twelve Months |
| us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableNextRollingTwelveMonths |
| Amount of minimum lease payments to be received by the lessor for capital leases in the next 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:CapitalLeasesFutureMinimumPaymentsReceivableNextRollingTwelveMonths |