cm:Concept: us-gaap:RefundsDueUnderGovernmentContractsNotReasonablyEstimable
| Refunds Due under Government Contracts Not Reasonably Estimable |
| us-gaap:RefundsDueUnderGovernmentContractsNotReasonablyEstimable |
| Description of refunds which may be paid in connection with government contract renegotiations that exist at the balance sheet date but cannot be reasonably estimated. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RefundsDueUnderGovernmentContractsNotReasonablyEstimable |