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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Sep. 30, 2022
Expendable parts and supplies, net:    
Expendable parts and supplies $ 35,048 $ 31,913
Less: obsolescence and other (8,294) (5,198)
Expendable parts and supplies, net 26,754 26,715
Prepaid expenses and other current assets:    
Prepaid aviation insurance 3,100 2,618
Prepaid vendors 1,155 1,310
Prepaid other insurance 758 1,268
Lease incentives 143 352
Prepaid fuel and other 1,185 1,068
Prepaid expenses and other current assets 6,341 6,616
Property and equipment, net:    
Property and equipment-gross 1,277,917 1,270,563
Less: accumulated depreciation (409,890) (405,309)
Property and equipment-net 868,027 865,254
Other assets:    
Investments in equity securities 15,331 15,178
Lease incentives 1,026 1,097
Contract asset 9,526  
Other 515 15
Other assets 26,398 16,290
Other accrued expenses:    
Accrued property taxes 3,852 5,866
Accrued interest 2,904 2,882
Accrued vacation 6,754 4,746
Accrued lodging 5,477 3,795
Accrued maintenance 2,861 1,453
Accrued liability on government payroll program   2,967
Accrued simulator costs 885 1,045
Accrued employee benefits 1,991 1,679
Accrued fleet operating expense 399 1,606
Short term lease incentive liability 97 97
Other 2,861 2,864
Other accrued expenses 28,081 29,000
Other noncurrent liabilities:    
Warrant liabilities 25,225 25,225
Lease incentive obligations 1,050 1,050
Long-term employee benefits 733 1,123
Other 1,821 1,821
Other noncurrent liabilities 28,829 29,219
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 1,266,985 1,260,143
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 6,019 5,577
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 1,062 992
Building [Member]    
Property and equipment, net:    
Property and equipment-gross 777 777
Furniture and Fixtures [Member]    
Property and equipment, net:    
Property and equipment-gross $ 298 $ 298