cm:Level1TextBlock: us-gaap:SupplementalBalanceSheetDisclosuresTextBlock
| Supplemental Balance Sheet Disclosures [Text Block] |
| us-gaap:SupplementalBalanceSheetDisclosuresTextBlock |
| The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SupplementalBalanceSheetDisclosuresTextBlock |
| SupplementalBalanceSheetDisclosures |