cm:Level3TextBlock: us-gaap:ScheduleOfRestructuringReserveByTypeOfCostTextBlock
| Schedule of Restructuring Reserve by Type of Cost [Table Text Block] |
| us-gaap:ScheduleOfRestructuringReserveByTypeOfCostTextBlock |
| Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfRestructuringReserveByTypeOfCostTextBlock |
| RestructuringReserveByTypeOfCost |