cm:Level1TextBlock: us-gaap:QuarterlyFinancialInformationTextBlock
| Quarterly Financial Information [Text Block] |
| us-gaap:QuarterlyFinancialInformationTextBlock |
| The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:QuarterlyFinancialInformationTextBlock |
| QuarterlyFinancialInformation |