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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Expendable parts and supplies, net:    
Expendable parts and supplies $ 42,325 $ 39,630
Less: expendable parts warranty (6,995) (6,295)
Less: obsolescence (4,678) (4,090)
Expendable parts and supplies, net 30,652 29,245
Property and equipment, net:    
Property and equipment-gross 760,337 1,049,203
Less: accumulated depreciation (255,214) (351,181)
Property and equipment, net 505,123 698,022
Other assets:    
Investments in equity securities 300 20,320
Lease incentives 847 954
Contract asset 6,937 8,756
Other 485 516
Other assets 8,569 30,546
Other accrued expenses:    
Accrued property taxes 3,896 5,281
Accrued interest 4,416 3,447
Accrued vacation 7,357 6,763
Accrued lodging 3,111 3,984
Accrued maintenance 1,808 2,117
Accrued simulator costs 1,512 1,006
Accrued employee benefits 1,845 1,450
Accrued fleet operating expense 2,217 650
Other 6,319 2,303
Other accrued expenses 32,481 27,001
Other noncurrent liabilities:    
Warrant liabilities 25,225 25,225
Lease incentive obligations 1,050 1,050
Long-term employee benefits 432 429
Other 1,819 1,818
Other noncurrent liabilities 28,526 28,522
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 750,926 1,039,782
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross $ 9,411 $ 9,421