cm:Concept: us-gaap:RevenueInformationUsedToAssessVariableConsiderationConstraint
| Revenue, Information Used to Assess Variable Consideration Constraint |
| us-gaap:RevenueInformationUsedToAssessVariableConsiderationConstraint |
| Description of methods, inputs, and assumptions used to assess estimate of variable consideration with probability of subsequent revenue reversal. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenueInformationUsedToAssessVariableConsiderationConstraint |