cm:Concept: us-gaap:BusinessCombinationReasonForBusinessCombination
| Business Combination, Reason for Business Combination |
| us-gaap:BusinessCombinationReasonForBusinessCombination |
| This element represents a description of the primary reason for the business combination which may consist of general categories such as top-line growth, synergistic benefits, market share, and diversification and the more detailed factors that might apply. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:BusinessCombinationReasonForBusinessCombination |