cm:Level1TextBlock: us-gaap:ProductWarrantyDisclosureTextBlock
| Product Warranty Disclosure [Text Block] |
| us-gaap:ProductWarrantyDisclosureTextBlock |
| The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ProductWarrantyDisclosureTextBlock |
| ProductWarrantyDisclosure |