cm:Concept: us-gaap:InventoryForLongTermContractsOrProgramsDescription
| Inventory for Long-term Contracts or Programs, Description |
| us-gaap:InventoryForLongTermContractsOrProgramsDescription |
| Description of inventories, or other deferred costs, associated with long-term contracts or programs at the balance sheet date including the disclosure of the amount of and types of deferred costs recorded; principal assumptions where average costs per unit is used; inventories held associated with customer claims; amount of progress payments netted against recorded inventory; or other deferred costs recorded; and unrecovered production costs. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:InventoryForLongTermContractsOrProgramsDescription |