cm:Concept: us-gaap:ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear
       
          
          | Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected in Next Twelve Months | 
       
       
          
          | us-gaap:ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear | 
       
       
          
          | Amount of billed or unbilled claims or similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts that are expected to be collected in the next fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | As Of (instant) | 
       
       
          
          | Debit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear |