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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
Expendable parts and supplies, net:    
Expendable parts and supplies $ 23,441 $ 39,089
Less: expendable parts warranty (4,355) (6,079)
Less: obsolescence (2,914) (4,738)
Expendable parts and supplies, net 16,172 28,272
Property and equipment, net:    
Property and equipment-gross 59,692 600,924
Less: accumulated depreciation (27,842) (174,573)
Property and equipment-net 31,850 426,351
Property and equipment, net 31,850 426,351
Other assets:    
Investments in equity securities 350 300
Lease incentives   812
Contract asset 4,441 6,081
Other 675 516
Other assets 5,466 7,709
Other accrued expenses:    
Accrued property taxes 2,483 4,650
Accrued interest 1,029 2,997
Accrued vacation 6,497 7,421
Accrued lodging 4,092 4,433
Accrued maintenance 1,415 2,493
Accrued employee benefits 1,550 1,075
Accrued fleet operating expense 412 2,751
Other 5,537 6,488
Other accrued expenses 23,015 32,308
Other noncurrent liabilities:    
Warrant liabilities 100 25,225
Lease incentive obligations   1,050
Long-term employee benefits 1,737 485
Other   1,819
Other noncurrent liabilities 1,837 28,579
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 50,104 591,421
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross $ 9,588 $ 9,503