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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Expendable parts and supplies, net:    
Expendable parts and supplies $ 31,817 $ 29,297
Less: obsolescence and other (5,562) (4,830)
Expendable parts and supplies, net 26,255 24,467
Prepaid expenses and other current assets:    
Prepaid aviation insurance 2,236 2,171
Lease incentives 1,792 1,445
Other 3,580 3,269
Prepaid expenses and other current assets 7,608 6,885
Property and equipment, net:    
Property and equipment-gross 1,517,533 1,621,437
Less: accumulated depreciation (453,184) (469,546)
Property and equipment-net 1,064,349 1,151,891
Other assets:    
Investments in equity securities 19,904 25,149
Lease incentives 12,904 10,957
Other 65 15
Other assets 32,873 36,121
Other accrued expenses:    
Accrued property taxes 3,940 8,783
Accrued interest 2,546 2,565
Accrued vacation 5,190 5,936
Other 19,730 16,373
Other accrued expenses 31,406 33,657
Other noncurrent liabilities:    
Warrant liabilities 25,225 21,964
Lease incentive obligations 6,503 6,358
Other 4,666 6,269
Other noncurrent liabilities 36,394 34,591
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 1,507,441 1,611,544
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 5,369 4,934
Leasehold Improvements [Member]    
Property and equipment, net:    
Property and equipment-gross 2,776 2,776
Vehicles [Member]    
Property and equipment, net:    
Property and equipment-gross 950 1,184
Building [Member]    
Property and equipment, net:    
Property and equipment-gross 699 699
Furniture and Fixtures [Member]    
Property and equipment, net:    
Property and equipment-gross $ 298 $ 300