cm:Concept: us-gaap:PurchaseObligationDueAfterFifthYear
| Purchase Obligation, Due after Fifth Year |
| us-gaap:PurchaseObligationDueAfterFifthYear |
| Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:PurchaseObligationDueAfterFifthYear |