cm:Concept: us-gaap:FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths
| Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months |
| us-gaap:FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths |
| Amount of lessee's undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths |