cm:Level2TextBlock: us-gaap:GoodwillAndIntangibleAssetsIntangibleAssetsIndefiniteLivedPolicy
| Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy [Policy Text Block] |
| us-gaap:GoodwillAndIntangibleAssetsIntangibleAssetsIndefiniteLivedPolicy |
| Disclosure of accounting policy for indefinite-lived intangible assets (that is, those intangible assets not subject to amortization). This accounting policy also may address how the entity assesses whether events and circumstances continue to support an indefinite useful life and 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:GoodwillAndIntangibleAssetsIntangibleAssetsIndefiniteLivedPolicy |