cm:Concept: us-gaap:DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization
| Disposal Group, Including Discontinued Operation, Depreciation and Amortization |
| us-gaap:DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization |
| Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization |