cm:Level2TextBlock: us-gaap:IntangibleAssetsFiniteLivedPolicy
| Intangible Assets, Finite-Lived, Policy [Policy Text Block] |
| us-gaap:IntangibleAssetsFiniteLivedPolicy |
| Disclosure of accounting policy for finite-lived intangible assets. This accounting policy also might address: (1) the amortization method used; (2) the useful lives of such assets; and (3) how the entity assesses and measures impairment of such assets. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:IntangibleAssetsFiniteLivedPolicy |