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Balance Sheet Information - Summary of Certain Significant Amounts Included in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Expendable parts and supplies, net:      
Expendable parts and supplies $ 39,404 $ 39,089 $ 39,630
Less: expendable parts warranty (5,574) (6,079) (6,295)
Less: obsolescence (4,658) (4,738) (4,090)
Expendable parts and supplies, net 29,172 28,272 29,245
Property and equipment, net:      
Property and equipment-gross 329,619 600,924 1,049,203
Less: accumulated depreciation (126,052) (174,573) (351,181)
Property and equipment, net 203,567 426,351 698,022
Other assets:      
Investments in equity securities 300 300 20,320
Lease incentives   812 954
Contract asset 5,400 6,081 8,756
Other 1,129 516 516
Other assets 6,829 7,709 30,546
Other accrued expenses:      
Accrued property taxes 4,722 4,650 5,281
Accrued interest 3,207 2,997 3,447
Accrued vacation 7,308 7,421 6,763
Accrued lodging 3,847 4,433 3,984
Accrued maintenance 1,911 2,493 2,117
Accrued employee benefits 1,528 1,075 1,450
Accrued fleet operating expense 3,118 2,751 650
Other 8,841 6,488 3,309
Other accrued expenses 34,482 32,308 27,001
Other noncurrent liabilities:      
Warrant liabilities 25,225 25,225 25,225
Lease incentive obligations   1,050 1,050
Long-term employee benefits 537 485 429
Other 913 1,819 1,818
Other noncurrent liabilities 26,675 28,579 28,522
Aircraft and Other Flight Equipment [Member]      
Property and equipment, net:      
Property and equipment-gross 319,831 591,421 1,039,782
Other Machinery and Equipment [Member]      
Property and equipment, net:      
Property and equipment-gross $ 9,788 $ 9,503 $ 9,421