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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 31,817 | $ 29,297
Less: obsolescence and other | (5,562) | (4,830)
Expendable parts and supplies, net | 26,255 | 24,467
Prepaid expenses and other current assets: |  |
Prepaid aviation insurance | 2,236 | 2,171
Lease incentives | 1,792 | 1,445
Other | 3,580 | 3,269
Prepaid expenses and other current assets | 7,608 | 6,885
Property and equipment, net: |  |
Property and equipment-gross | 1,517,533 | 1,621,437
Less: accumulated depreciation | (453,184) | (469,546)
Property and equipment-net | 1,064,349 | 1,151,891
Other assets: |  |
Investments in equity securities | 19,904 | 25,149
Lease incentives | 12,904 | 10,957
Other | 65 | 15
Other assets | 32,873 | 36,121
Other accrued expenses: |  |
Accrued property taxes | 3,940 | 8,783
Accrued interest | 2,546 | 2,565
Accrued vacation | 5,190 | 5,936
Other | 19,730 | 16,373
Other accrued expenses | 31,406 | 33,657
Other noncurrent liabilities: |  |
Warrant liabilities | 25,225 | 21,964
Lease incentive obligations | 6,503 | 6,358
Other | 4,666 | 6,269
Other noncurrent liabilities | 36,394 | 34,591
Aircraft and Other Flight Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,507,441 | 1,611,544
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 5,369 | 4,934
Leasehold Improvements [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 2,776 | 2,776
Vehicles [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 950 | 1,184
Building [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 699 | 699
Furniture and Fixtures [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | $ 298 | $ 300

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