cm:Concept: us-gaap:RevenueChangeInJudgment
| Revenue, Change in Judgment |
| us-gaap:RevenueChangeInJudgment |
| Description of change in judgment affecting determination of amount and timing of revenue from contract with customer. Includes, but is not limited to, change in judgment for timing of satisfaction of performance obligation, transaction price and amount allocated to performance obligation. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenueChangeInJudgment |