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Balance Sheet Information - Summary of Certain Significant Amounts Included in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Expendable parts and supplies, net:    
Expendable parts and supplies $ 31,913 $ 29,297
Less: obsolescence and other (5,198) (4,830)
Expendable parts and supplies, net 26,715 24,467
Prepaid expenses and other current assets:    
Prepaid aviation insurance 2,618 2,171
Prepaid vendors 1,310 893
Prepaid other insurance 1,268 1,323
Lease Incentives 352 1,445
Other 1,068 1,053
Prepaid expenses and other current assets 6,616 6,885
Property and equipment, net:    
Property and equipment-gross 1,270,563 1,621,437
Less: accumulated depreciation (405,309) (469,546)
Property and equipment-net 865,254 1,151,891
Other assets:    
Investments in equity securities 15,178 25,149
Lease incentives 1,097 10,957
Other 15 15
Other assets 16,290 36,121
Other accrued expenses:    
Accrued property taxes 5,866 8,783
Accrued interest 2,882 2,565
Accrued vacation 4,746 5,936
Accrued lodging 3,795 3,380
Accrued maintenance 1,453 1,580
Accrued liability on government payroll program 2,967 2,775
Accrued simulator costs 1,045 457
Accrued employee benefits 1,679 981
Accrued fleet operating expense 1,606 786
Short term lease incentive liability 97 3,318
Other 2,864 3,096
Other accrued expenses 29,000 33,657
Other noncurrent liabilities:    
Warrant liabilities 25,225 21,964
Lease incentive obligations 1,050 6,358
Long term employee benefits 1,123 1,447
Long term liability on government payroll program   2,775
Other 1,821 2,047
Other noncurrent liabilities 29,219 34,591
Aircraft and Other Flight Equipment Substantially Pledged [Member]    
Property and equipment, net:    
Property and equipment-gross 1,260,143 1,611,544
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 5,577 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 992 1,184
Building [Member]    
Property and equipment, net:    
Property and equipment-gross 777 699
Furniture and Fixtures [Member]    
Property and equipment, net:    
Property and equipment-gross $ 298 $ 300