cm:Concept: us-gaap:BusinessCombinationSegmentReportingAssignmentOfGoodwillNotComplete
| Business Combination, Segment Reporting, Assignment of Goodwill Not Complete |
| us-gaap:BusinessCombinationSegmentReportingAssignmentOfGoodwillNotComplete |
| This element represents disclosure of the fact that the required assignment of goodwill to reporting units has not been completed as of the date the financial statements are issued. The amount of goodwill assigned to reportable segments is included with the segment reporting disclosure in the taxonomy. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:BusinessCombinationSegmentReportingAssignmentOfGoodwillNotComplete |