cm:Concept: us-gaap:AmortizationOfAcquisitionCosts
| Amortization of Acquisition Costs |
| us-gaap:AmortizationOfAcquisitionCosts |
| The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:AmortizationOfAcquisitionCosts |