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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Expendable parts and supplies, net:    
Expendable parts and supplies $ 39,404 $ 39,089
Less: expendable parts warranty (5,574) (6,079)
Less: obsolescence (4,658) (4,738)
Expendable parts and supplies, net 29,172 28,272
Property and equipment, net:    
Property and equipment-gross 329,619 600,924
Less: accumulated depreciation (126,052) (174,573)
Property and equipment, net 203,567 426,351
Other assets:    
Investments in equity securities 300 300
Lease incentives 0 812
Contract asset 5,400 6,081
Other 1,129 516
Other assets 6,829 7,709
Other accrued expenses:    
Accrued property taxes 4,722 4,650
Accrued interest 3,207 2,997
Accrued vacation 7,308 7,421
Accrued lodging 3,847 4,433
Accrued maintenance 1,911 2,493
Accrued employee benefits 1,528 1,075
Accrued fleet operating expense 3,118 2,751
Other 9,178 6,488
Other accrued expenses 34,819 32,308
Other noncurrent liabilities:    
Warrant liabilities 25,225 25,225
Lease incentive obligations 0 1,050
Long-term employee benefits 537 485
Other 913 1,819
Other noncurrent liabilities 26,675 28,579
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 319,831 591,421
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross $ 9,788 $ 9,503