cm:Member: us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember
| Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |
| us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember |
| Component or group of components classified as held-for-sale or disposed of by sale and representing a strategic shift that has or will have a major effect on operations and financial results. Includes a business or nonprofit activity on acquisition classified as held-for-sale. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember |