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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Expendable parts and supplies, net:    
Expendable parts and supplies $ 38,123 $ 31,913
Less: obsolescence and other (9,392) (5,198)
Expendable parts and supplies, net 28,731 26,715
Prepaid expenses and other current assets:    
Prepaid aviation insurance 3,176 2,618
Prepaid vendors 143 1,310
Prepaid other insurance 1,290 1,268
Lease incentives 337 352
Prepaid fuel and other 1,418 1,068
Prepaid expenses and other current assets 6,364 6,616
Property and equipment, net:    
Property and equipment-gross 1,050,508 1,270,563
Less: accumulated depreciation (340,814) (405,309)
Property and equipment-net 709,694 865,254
Other assets:    
Investments in equity securities 18,187 15,178
Lease incentives 990 1,097
Contract asset 9,149  
Other 515 15
Other assets 28,841 16,290
Other accrued expenses:    
Accrued property taxes 4,682 5,866
Accrued interest 5,247 2,882
Accrued vacation 6,832 4,746
Accrued lodging 4,181 3,795
Accrued maintenance 638 1,453
Accrued liability on government payroll program   2,967
Accrued simulator costs 931 1,045
Accrued employee benefits 1,331 1,679
Accrued fleet operating expense 504 1,606
Short term lease incentive liability 97 97
Other 2,278 2,864
Other accrued expenses 26,721 29,000
Other noncurrent liabilities:    
Warrant liabilities 25,225 25,225
Lease incentive obligations 1,050 1,050
Long-term employee benefits 610 1,123
Other 1,821 1,821
Other noncurrent liabilities 28,706 29,219
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 1,041,056 1,260,143
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross $ 9,452 $ 10,420