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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Expendable parts and supplies, net:    
Expendable parts and supplies $ 40,215 $ 39,630
Less: expendable parts warranty (7,218) (6,295)
Less: obsolescence (4,167) (4,090)
Expendable parts and supplies, net 28,830 29,245
Prepaid expenses and other current assets:    
Prepaid aviation insurance 1,596 3,176
Prepaid vendors 896 143
Prepaid other insurance 761 1,205
Lease incentives 143 1,125
Prepaid fuel and other 1,080 1,645
Prepaid expenses and other current assets 4,476 7,294
Property and equipment, net:    
Property and equipment-gross 788,903 1,049,203
Less: accumulated depreciation (254,444) (351,181)
Property and equipment-net 534,459 698,022
Other assets:    
Investments in equity securities 23,021 20,320
Lease incentives 919 954
Contract asset 8,309 8,756
Other 515 516
Other assets 32,764 30,546
Other accrued expenses:    
Accrued property taxes 3,052 5,281
Accrued interest 5,099 3,447
Accrued vacation 6,933 6,763
Accrued lodging 3,165 3,984
Accrued maintenance 1,546 2,117
Accrued simulator costs 242 1,006
Accrued employee benefits 1,681 1,450
Accrued fleet operating expense 1,668 650
Other 4,388 2,303
Other accrued expenses 27,774 27,001
Other noncurrent liabilities:    
Warrant liabilities 25,225 25,225
Lease incentive obligations 1,050 1,050
Long-term employee benefits 495 429
Other 1,819 1,818
Other noncurrent liabilities 28,589 28,522
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 779,436 1,039,782
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross $ 9,467 $ 9,421