cm:Level3TextBlock: us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTextBlock
       
          
          | Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable [Table Text Block] | 
       
       
          
          | us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTextBlock | 
       
       
          
          | Tabular disclosure of the equity interest issued or issuable in a business acquisition (or series of individually immaterial business acquisitions) planned, initiated, or completed during the period. | 
       
       
          
          | cm:Level3TextBlock | 
       
       
          
          | Text Block (HTML) (nonnum:textBlockItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTextBlock | 
       
       
          
          | BusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuable |