cm:Level2TextBlock: us-gaap:RevenueRecognitionCompletedContractMethod
| Revenue Recognition, Completed-Contract Method [Policy Text Block] |
| us-gaap:RevenueRecognitionCompletedContractMethod |
| Disclosure of accounting policy for revenue recognition for long-term construction-type contracts accounted for using the completed-contract method. This includes the criteria used to determine when a project is substantially complete. If the entity departs from using the completed-contract method for a single contract or a group of contracts, such a departure from the basic policy is disclosed. The disclosure may also describe the accounting for significant changes in estimates. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenueRecognitionCompletedContractMethod |