cm:Level1TextBlock: us-gaap:DeferredRevenueDisclosureTextBlock
| Deferred Revenue Disclosure [Text Block] |
| us-gaap:DeferredRevenueDisclosureTextBlock |
| The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DeferredRevenueDisclosureTextBlock |
| DeferredRevenueDisclosure |