cm:Concept: us-gaap:ContractReceivableDueFiveYearsOrMore
| Contract Receivable, Due after Year Five |
| us-gaap:ContractReceivableDueFiveYearsOrMore |
| Amount billed to customers under long-term contracts or programs to be collected after the fifth fiscal year following the latest fiscal year. Excludes amounts due that have been withheld because of retainage provisions in a contract. 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:ContractReceivableDueFiveYearsOrMore |