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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 30,877 | $ 29,297
Less: obsolescence and other | (5,671) | (4,830)
Expendable parts and supplies, net | 25,206 | 24,467
Prepaid expenses and other current assets: |  |
Prepaid aviation insurance | 140 | 2,171
Lease incentives | 1,715 | 1,445
Other | 2,633 | 3,269
Prepaid expenses and other current assets | 4,488 | 6,885
Property and equipment, net: |  |
Property and equipment-gross | 1,647,076 | 1,621,437
Less: accumulated depreciation | (489,154) | (469,546)
Property and equipment-net | 1,157,922 | 1,151,891
Other assets: |  |
Investments in equity securities | 19,005 | 25,149
Lease incentives | 12,705 | 10,957
Other | 42 | 15
Other assets | 31,752 | 36,121
Other accrued expenses: |  |
Accrued property taxes | 8,598 | 8,783
Accrued interest | 4,481 | 2,565
Accrued vacation | 5,829 | 5,936
Other | 17,375 | 16,373
Other accrued expenses | 36,283 | 33,657
Other noncurrent liabilities: |  |
Warrant liabilities | 22,064 | 21,964
Lease incentive obligations | 7,289 | 6,358
Other | 4,253 | 6,269
Other noncurrent liabilities | 33,606 | 34,591
Aircraft and Other Flight Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,637,154 | 1,611,544
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 4,971 | 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 | 1,184 | 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 | $ 292 | $ 300

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