cm:Concept: us-gaap:DisposalGroupIncludingDiscontinuedOperationChangesToPlanOfSale
| Disposal Group, Including Discontinued Operation, Changes to Plan of Sale |
| us-gaap:DisposalGroupIncludingDiscontinuedOperationChangesToPlanOfSale |
| Description of the facts and circumstances leading to the decision to change the plan to sell the disposal group, including discontinued operation, and its effect on the results of operations of the period and any prior periods presented. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DisposalGroupIncludingDiscontinuedOperationChangesToPlanOfSale |