cm:Concept: us-gaap:FutureMinimumSubleaseRentalsSaleLeasebackTransactionsDueInRollingAfterYearFive
| Future Minimum Sublease Rentals, Sale Leaseback Transactions, Due in Rolling after Year Five |
| us-gaap:FutureMinimumSubleaseRentalsSaleLeasebackTransactionsDueInRollingAfterYearFive |
| Amount of minimum sublease rentals for sale-leaseback transactions accounted for using the deposit method or as a financing to be received by the seller-lessee after the fifth 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) |
| Debit |
| false |
| us-gaap:FutureMinimumSubleaseRentalsSaleLeasebackTransactionsDueInRollingAfterYearFive |