cm:Table: us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable
| Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable [Table] |
| us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable |
| Schedule of the equity interest (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire an entity in a business combination. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable |