cm:Level3TextBlock: us-gaap:CashFlowOperatingCapitalTableTextBlock
| Cash Flow, Operating Capital [Table Text Block] |
| us-gaap:CashFlowOperatingCapitalTableTextBlock |
| Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:CashFlowOperatingCapitalTableTextBlock |
| CashFlowOperatingCapital |