cm:Concept: us-gaap:CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
| Cash Provided by (Used in) Operating Activities, Discontinued Operations |
| us-gaap:CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations |
| Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations |