cm:Concept: us-gaap:RestructuringAndRelatedCostDescription
| Restructuring and Related Cost, Description |
| us-gaap:RestructuringAndRelatedCostDescription |
| Information pertinent to an understanding of the specified type of restructuring cost, including the facts and circumstances leading to the expected activity, discussion of the level and quantity of personnel to be terminated, and the expected completion date. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RestructuringAndRelatedCostDescription |