cm:Concept: us-gaap:ContractsReceivableClaimsAndUncertainAmountsNatureAndStatus
       
          
          | Contracts Receivable, Claims and Uncertain Amounts, Nature and Status | 
       
       
          
          | us-gaap:ContractsReceivableClaimsAndUncertainAmountsNatureAndStatus | 
       
       
          
          | Explanation of the amounts included within receivables, billed or unbilled, under long-term contracts, which represent claims or other similar items subject to uncertainty concerning their determination or ultimate realization. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Text/String (xbrli:stringItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:ContractsReceivableClaimsAndUncertainAmountsNatureAndStatus |