cm:Level2TextBlock: us-gaap:GoodwillAndIntangibleAssetsIntangibleAssetsPolicy
| Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] |
| us-gaap:GoodwillAndIntangibleAssetsIntangibleAssetsPolicy |
| Disclosure of accounting policy for intangible assets. This accounting policy may address both intangible assets subject to amortization and those that are not. The following also may be disclosed: (1) a description of intangible assets (2) the estimated useful lives of those assets (3) the amortization method used (4) how the entity assesses and measures impairment of such assets (5) how future cash flows are estimated (6) how the fair values of such asset are determined. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:GoodwillAndIntangibleAssetsIntangibleAssetsPolicy |