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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Expendable parts and supplies, net:    
Expendable parts and supplies $ 26,368 $ 25,336
Less: obsolescence and other (3,950) (3,999)
Expendable parts and supplies, net 22,418 21,337
Prepaid expenses and other current assets:    
Prepaid aircraft rent   35,786
Deferred reimbursed costs 1,387 2,092
Other 5,756 3,045
Prepaid expenses and other current assets 7,143 40,923
Property and equipment, net:    
Property and equipment-gross 1,607,966 1,592,043
Less: accumulated depreciation (374,239) (318,458)
Property and equipment-net 1,233,727 1,273,585
Other accrued expenses:    
Accrued property taxes 9,035 9,186
Accrued interest 5,941 4,497
Accrued vacation 5,767 6,128
Deferred revenue-current portion 3,760  
Other 13,160 9,077
Other accrued expenses 37,663 28,888
Aircraft and Other Flight Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 1,597,916 1,582,199
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 5,323 5,122
Leasehold Improvements [Member]    
Property and equipment, net:    
Property and equipment-gross 2,763 2,797
Vehicles [Member]    
Property and equipment, net:    
Property and equipment-gross 962 924
Building [Member]    
Property and equipment, net:    
Property and equipment-gross 699 699
Furniture and Fixtures [Member]    
Property and equipment, net:    
Property and equipment-gross $ 303 $ 302