cm:Level2TextBlock: us-gaap:SellingGeneralAndAdministrativeExpensesPolicyTextBlock
       
          
          | Selling, General and Administrative Expenses, Policy [Policy Text Block] | 
       
       
          
          | us-gaap:SellingGeneralAndAdministrativeExpensesPolicyTextBlock | 
       
       
          
          | Disclosure of accounting policy for inclusion of significant items in the selling, general and administrative (or similar) expense report caption. | 
       
       
          
          | cm:Level2TextBlock | 
       
       
          
          | Text Block (HTML) (nonnum:textBlockItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:SellingGeneralAndAdministrativeExpensesPolicyTextBlock |