cm:Concept: us-gaap:PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
| Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized |
| us-gaap:PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized |
| The carrying amount as of the balance sheet date of capitalized preproduction costs incurred on long-term supply arrangements, including recoverable costs to design and develop products. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized |