cm:Concept: us-gaap:StandardAndExtendedProductWarrantyAccrualForeignCurrencyTranslationGainLoss
| Standard and Extended Product Warranty Accrual, Foreign Currency Translation Gain (Loss) |
| us-gaap:StandardAndExtendedProductWarrantyAccrualForeignCurrencyTranslationGainLoss |
| Amount of foreign currency translation gain (loss) which decreases (increases) the standard and extended product warranty accrual. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:StandardAndExtendedProductWarrantyAccrualForeignCurrencyTranslationGainLoss |