cm:Level1TextBlock: us-gaap:SupplementalBalanceSheetDisclosuresTextBlock
       
          
          | Supplemental Balance Sheet Disclosures [Text Block] | 
       
       
          
          | us-gaap:SupplementalBalanceSheetDisclosuresTextBlock | 
       
       
          
          | The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. | 
       
       
          
          | cm:Level1TextBlock | 
       
       
          
          | Text Block (HTML) (nonnum:textBlockItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:SupplementalBalanceSheetDisclosuresTextBlock | 
       
       
          
          | SupplementalBalanceSheetDisclosures |