cm:Concept: us-gaap:ContractReceivableDueOneToTwoYears
| Contract Receivable, Due in Year Two |
| us-gaap:ContractReceivableDueOneToTwoYears |
| Amount billed to customers under long-term contracts or programs to be collected in the second 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:ContractReceivableDueOneToTwoYears |