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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Expendable parts and supplies, net: |  |  |
Expendable parts and supplies | $ 23,441 | $ 39,089 | $ 39,630
Less: expendable parts warranty | (4,355) | (6,079) | (6,295)
Less: obsolescence | (2,914) | (4,738) | (4,090)
Expendable parts and supplies, net | 16,172 | 28,272 | 29,245
Prepaid expenses and other current assets: |  |  |
Prepaid aviation insurance |  | 740 | 3,176
Prepaid vendors |  | 966 | 143
Prepaid other insurance |  | 1,066 | 1,205
Lease Incentives |  | 143 | 1,125
Prepaid fuel and other |  | 456 | 1,645
Prepaid expenses and other current assets | 2,714 | 3,371 | 7,294
Property and equipment, net: |  |  |
Property and equipment-gross | 59,692 | 600,924 | 1,049,203
Less: accumulated depreciation | (27,842) | (174,573) | (351,181)
Property and equipment-net | 31,850 | 426,351 | 698,022
Property and equipment, net | 31,850 | 426,351 |
Other assets: |  |  |
Investments in equity securities | 350 | 300 | 20,320
Lease incentives |  | 812 | 954
Contract asset | 4,441 | 6,081 | 8,756
Other | 675 | 516 | 516
Other assets | 5,466 | 7,709 | 30,546
Other accrued expenses: |  |  |
Accrued property taxes | 2,483 | 4,650 | 5,281
Accrued interest | 1,029 | 2,997 | 3,447
Accrued vacation | 6,497 | 7,421 | 6,763
Accrued lodging | 4,092 | 4,433 | 3,984
Accrued maintenance | 1,415 | 2,493 | 2,117
Accrued employee benefits | 1,550 | 1,075 | 1,450
Accrued fleet operating expense | 412 | 2,751 | 650
Other | 5,537 | 6,488 | 3,309
Other accrued expenses | 23,015 | 32,308 | 27,001
Other noncurrent liabilities: |  |  |
Warrant liabilities | 100 | 25,225 | 25,225
Lease incentive obligations |  | 1,050 | 1,050
Long-term employee benefits | 1,737 | 485 | 429
Other |  | 1,819 | 1,818
Other noncurrent liabilities | 1,837 | 28,579 | 28,522
Aircraft and Other Flight Equipment [Member] |  |  |
Property and equipment, net: |  |  |
Property and equipment-gross | 50,104 | 591,421 | 1,039,782
Other Machinery and Equipment [Member] |  |  |
Property and equipment, net: |  |  |
Property and equipment-gross | $ 9,588 | $ 9,503 | $ 9,421

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