cm:Concept: us-gaap:CapitalLeasesLesseeBalanceSheetAssetsByMajorClassFlightEquipmentAccumulatedDepreciation
| Capital Leases, Lessee Balance Sheet, Assets by Major Class, Flight Equipment, Accumulated Depreciation |
| us-gaap:CapitalLeasesLesseeBalanceSheetAssetsByMajorClassFlightEquipmentAccumulatedDepreciation |
| The cumulative amount of depreciation that has been recognized in the income statement related to long-lived, depreciable flight assets used in the entity's principle business operations, subject to a lease and meeting the criteria for capitalization. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:CapitalLeasesLesseeBalanceSheetAssetsByMajorClassFlightEquipmentAccumulatedDepreciation |