cm:Concept: us-gaap:DepreciationAndAmortization
| Depreciation, Depletion and Amortization, Nonproduction |
| us-gaap:DepreciationAndAmortization |
| The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:DepreciationAndAmortization |