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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 27,324 | $ 27,431
Less: obsolescence and other | (4,280) | (4,460)
Expendable parts and supplies, net | 23,044 | 22,971
Prepaid expenses and other current assets: |  |
Deferred offering and reimbursed costs |  | 1,261
Other | 8,956 | 14,806
Prepaid expenses and other current assets | 8,956 | 16,067
Property and equipment, net: |  |
Property and equipment-gross | 1,613,445 | 1,606,117
Less: accumulated depreciation | (432,761) | (393,702)
Property and equipment-net | 1,180,684 | 1,212,415
Other Assets: |  |
Warrants | 16,374 |
Other | 4,273 |
Other Assets | 20,647 | 742
Other accrued expenses: |  |
Accrued property taxes | 5,996 | 11,354
Accrued interest | 2,480 | 3,268
Accrued vacation | 5,718 | 5,975
Other | 14,416 | 24,881
Other accrued expenses | 28,610 | 45,478
Aircraft and Other Flight Equipment Substantially Pledged [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,603,377 | 1,596,174
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 5,189 | 5,147
Leasehold Improvements [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 2,763 | 2,763
Vehicles [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,114 | 1,032
Building [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 699 | 699
Furniture and Fixtures [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | $ 303 | $ 302

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