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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 29,135 | $ 27,431
Less: obsolescence and other | (4,428) | (4,460)
Expendable parts and supplies, net | 24,707 | 22,971
Prepaid expenses and other current assets: |  |
Deferred offering and reimbursed costs |  | 1,261
Prepaid aviation insurance | 4,662 | 2,396
Other | 4,294 | 12,410
Prepaid expenses and other current assets | 8,956 | 16,067
Property and equipment, net: |  |
Property and equipment-gross | 1,616,298 | 1,606,117
Less: accumulated depreciation | (452,105) | (393,702)
Property and equipment-net | 1,164,193 | 1,212,415
Other assets: |  |
Warrants | 16,374 |
Other | 8,941 | 742
Other assets | 25,315 | 742
Other accrued expenses: |  |
Accrued property taxes | 7,479 | 11,354
Accrued interest | 4,814 | 3,268
Accrued vacation | 5,967 | 5,975
Deferred PSP payments | 26,100 | 11,311
Other | 15,092 | 13,570
Other accrued expenses | 59,452 | 45,478
Aircraft and Other Flight Equipment Substantially Pledged [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,606,276 | 1,596,174
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 5,116 | 5,147
Leasehold Improvements [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 2,790 | 2,763
Vehicles [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,115 | 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 | $ 302 | $ 302

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