cm:Concept: us-gaap:UnrecoveredProductionCostsExcessOfEstimatedAverageUnitCost
| Unrecovered Production Costs, Excess of Estimated Average Unit Cost |
| us-gaap:UnrecoveredProductionCostsExcessOfEstimatedAverageUnitCost |
| The aggregate amount of manufacturing or production costs and any related deferred costs (for example, initial tooling costs) that exceeds the aggregate estimated cost of all in-process and delivered units on the basis of the estimated average cost of all units expected to be produced under long-term contracts and programs not yet complete. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:UnrecoveredProductionCostsExcessOfEstimatedAverageUnitCost |