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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 35,048 | $ 31,913
Less: obsolescence and other | (8,294) | (5,198)
Expendable parts and supplies, net | 26,754 | 26,715
Prepaid expenses and other current assets: |  |
Prepaid aviation insurance | 3,100 | 2,618
Prepaid vendors | 1,155 | 1,310
Prepaid other insurance | 758 | 1,268
Lease incentives | 143 | 352
Prepaid fuel and other | 1,185 | 1,068
Prepaid expenses and other current assets | 6,341 | 6,616
Property and equipment, net: |  |
Property and equipment-gross | 1,277,917 | 1,270,563
Less: accumulated depreciation | (409,890) | (405,309)
Property and equipment-net | 868,027 | 865,254
Other assets: |  |
Investments in equity securities | 15,331 | 15,178
Lease incentives | 1,026 | 1,097
Contract asset | 9,526 |
Other | 515 | 15
Other assets | 26,398 | 16,290
Other accrued expenses: |  |
Accrued property taxes | 3,852 | 5,866
Accrued interest | 2,904 | 2,882
Accrued vacation | 6,754 | 4,746
Accrued lodging | 5,477 | 3,795
Accrued maintenance | 2,861 | 1,453
Accrued liability on government payroll program |  | 2,967
Accrued simulator costs | 885 | 1,045
Accrued employee benefits | 1,991 | 1,679
Accrued fleet operating expense | 399 | 1,606
Short term lease incentive liability | 97 | 97
Other | 2,861 | 2,864
Other accrued expenses | 28,081 | 29,000
Other noncurrent liabilities: |  |
Warrant liabilities | 25,225 | 25,225
Lease incentive obligations | 1,050 | 1,050
Long-term employee benefits | 733 | 1,123
Other | 1,821 | 1,821
Other noncurrent liabilities | 28,829 | 29,219
Aircraft and Other Flight Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,266,985 | 1,260,143
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 6,019 | 5,577
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 | 1,062 | 992
Building [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 777 | 777
Furniture and Fixtures [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | $ 298 | $ 298

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