cm:Concept: us-gaap:MinimumLeasePaymentsSaleLeasebackTransactionsDueInRollingYearFour
| Minimum Lease Payments, Sale Leaseback Transactions, Due in Rolling Year Four |
| us-gaap:MinimumLeasePaymentsSaleLeasebackTransactionsDueInRollingYearFour |
| Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due in the fourth 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) |
| Credit |
| false |
| us-gaap:MinimumLeasePaymentsSaleLeasebackTransactionsDueInRollingYearFour |