cm:Concept: us-gaap:RevenuePracticalExpedientFinancingComponent
| Revenue, Practical Expedient, Financing Component [true false] |
| us-gaap:RevenuePracticalExpedientFinancingComponent |
| Indicates (true false) whether practical expedient was elected not to adjust consideration for effect of financing component when transfer and customer payment for product or service occurs within one year or less. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenuePracticalExpedientFinancingComponent |