cm:Concept: us-gaap:RevenueRecognitionSalesReturnsChangesInEstimatedReturns
| Revenue Recognition, Sales Returns, Changes in Estimated Returns |
| us-gaap:RevenueRecognitionSalesReturnsChangesInEstimatedReturns |
| In those circumstances in which an entity sells a good for which the buyer has the right of return (other than under warranty provisions), the entity discloses any material changes in its assumptions about estimated returns. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenueRecognitionSalesReturnsChangesInEstimatedReturns |