cm:Concept: us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
| Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |
| us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned |
| Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned |