cm:Concept: us-gaap:InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory
| Inventory for Long-term Contracts or Programs, General and Administrative Costs Included in Inventory |
| us-gaap:InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory |
| The actual or estimated amount of general and administrative expense remaining in inventory as of the balance sheet date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory |