cm:Concept: us-gaap:InterestPortionOfMinimumLeasePaymentsSaleLeasebackTransactions
| Interest Portion of Minimum Lease Payments, Sale Leaseback Transactions |
| us-gaap:InterestPortionOfMinimumLeasePaymentsSaleLeasebackTransactions |
| Amount necessary to reduce minimum lease payments to present value for sale-leaseback transactions accounted for using the deposit method or as a financing. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:InterestPortionOfMinimumLeasePaymentsSaleLeasebackTransactions |