cm:Concept: us-gaap:OperatingLeasesFutureMinimumPaymentsDueInTwoYears
| Operating Leases, Future Minimum Payments, Due in Two Years |
| us-gaap:OperatingLeasesFutureMinimumPaymentsDueInTwoYears |
| Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year 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:OperatingLeasesFutureMinimumPaymentsDueInTwoYears |