cm:Concept: us-gaap:ReceivablesLongTermContractsOrPrograms
       
          
          | Receivables, Long-term Contracts or Programs | 
       
       
          
          | us-gaap:ReceivablesLongTermContractsOrPrograms | 
       
       
          
          | Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | As Of (instant) | 
       
       
          
          | Debit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:ReceivablesLongTermContractsOrPrograms |