cm:Concept: us-gaap:OperatingLeasesFutureMinimumPaymentsDueInTwoAndThreeYears
| Operating Leases, Future Minimum Payments, Due in Two and Three Years |
| us-gaap:OperatingLeasesFutureMinimumPaymentsDueInTwoAndThreeYears |
| 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 and third 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:OperatingLeasesFutureMinimumPaymentsDueInTwoAndThreeYears |