cm:Table: us-gaap:NewAccountingPronouncementsOrChangeInAccountingPrincipleTable
       
          
          | New Accounting Pronouncements or Change in Accounting Principle [Table] | 
       
       
          
          | us-gaap:NewAccountingPronouncementsOrChangeInAccountingPrincipleTable | 
       
       
          
          | Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items. | 
       
       
          
          | cm:Table | 
       
       
          
          | Text/String (xbrli:stringItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | true | 
       
       
          
          | us-gaap:NewAccountingPronouncementsOrChangeInAccountingPrincipleTable |