cm:Concept: us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeNotPossible
| Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range Not Possible |
| us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeNotPossible |
| A statement that a range of reasonably possible change cannot be made for a tax position taken for which it is reasonably possible that the total amount of unrecognized tax benefit will significantly increase or decrease within 12 months of the balance sheet date. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeNotPossible |