cm:Concept: us-gaap:ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueModificationOfContract
| Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Modification of Contract |
| us-gaap:ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueModificationOfContract |
| Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueModificationOfContract |