cm:Concept: us-gaap:NetCashProvidedByUsedInContinuingOperations
| Net Cash Provided by (Used in) Continuing Operations |
| us-gaap:NetCashProvidedByUsedInContinuingOperations |
| The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:NetCashProvidedByUsedInContinuingOperations |