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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Expendable parts and supplies, net:    
Expendable parts and supplies $ 26,455 $ 25,336
Less: obsolescence and other (4,055) (3,999)
Expendable parts and supplies, net 22,400 21,337
Prepaid expenses and other current assets:    
Prepaid aircraft rent   35,786
Deferred offering and reimbursed costs 1,664 2,092
Other 2,838 3,045
Prepaid expenses and other current assets 4,502 40,923
Property and equipment, net:    
Property and equipment-gross 1,598,233 1,592,043
Less: accumulated depreciation (336,966) (318,458)
Property and equipment-net 1,261,267 1,273,585
Other accrued expenses:    
Accrued property taxes 11,018 9,186
Accrued interest 6,715 4,497
Accrued vacation 6,149 6,128
Accrued wheels, brakes and tires 3,072 1,513
Other 7,396 7,564
Other accrued expenses 34,350 28,888
Aircraft and Other Flight Equipment Substantially Pledged [Member]    
Property and equipment, net:    
Property and equipment-gross 1,588,368 1,582,199
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 5,122 5,122
Leasehold Improvements [Member]    
Property and equipment, net:    
Property and equipment-gross 2,797 2,797
Vehicles [Member]    
Property and equipment, net:    
Property and equipment-gross 945 924
Building [Member]    
Property and equipment, net:    
Property and equipment-gross 699 699
Furniture and Fixtures [Member]    
Property and equipment, net:    
Property and equipment-gross $ 302 $ 302