cm:Level3TextBlock: us-gaap:ScheduleOfCapitalUnitsTextBlock
| Schedule of Capital Units [Table Text Block] |
| us-gaap:ScheduleOfCapitalUnitsTextBlock |
| Tabular disclosure of an entity's capital units or capital shares, including the value of capital units or capital shares, units authorized, units outstanding and other information necessary to a fair presentation. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfCapitalUnitsTextBlock |
| CapitalUnits |