cm:Concept: us-gaap:ScheduleOfCashProceedsReceivedFromShareBasedPaymentAwardsTableTextBlock
| Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] (Deprecated 2017-01-31) |
| us-gaap:ScheduleOfCashProceedsReceivedFromShareBasedPaymentAwardsTableTextBlock |
| Tabular disclosure of the amount of cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the tax benefit realized from stock options exercised during the period. Disclosure may also include the intrinsic value of stock options exercised during the period. |
| cm:Concept |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfCashProceedsReceivedFromShareBasedPaymentAwardsTableTextBlock |
| CashProceedsReceivedfromSharebasedPaymentAwards |