cm:Level1TextBlock: us-gaap:AccountingChangesAndErrorCorrectionsTextBlock
       
          
          | Accounting Changes and Error Corrections [Text Block] | 
       
       
          
          | us-gaap:AccountingChangesAndErrorCorrectionsTextBlock | 
       
       
          
          | The entire disclosure for reporting accounting changes and error corrections. It includes the conveyance of information necessary for a user of the Company's financial information to understand all aspects and required disclosure information concerning all changes and error corrections reported in the Company's financial statements for the period. | 
       
       
          
          | cm:Level1TextBlock | 
       
       
          
          | Text Block (HTML) (nonnum:textBlockItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:AccountingChangesAndErrorCorrectionsTextBlock | 
       
       
          
          | AccountingChangesAndErrorCorrectionsDisclosures |