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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Expendable parts and supplies, net:
Expendable parts and supplies	$ 26,527	$ 25,336
Less: obsolescence and other	(4,149)	(3,999)
Expendable parts and supplies, net	22,378	21,337
Prepaid expenses and other current assets:
Prepaid aircraft rent		35,786
Deferred offering and reimbursed costs	1,514	2,092
Other	4,397	3,045
Prepaid expenses and other current assets	5,911	40,923
Property and equipment, net:
Property and equipment-gross	1,598,344	1,592,043
Less: accumulated depreciation	(355,547)	(318,458)
Property and equipment-net	1,242,797	1,273,585
Other accrued expenses:
Accrued property taxes	5,707	9,186
Accrued interest	4,488	4,497
Accrued vacation	5,538	6,128
Accrued wheels, brakes and tires	2,705	1,513
Other	8,700	7,564
Other accrued expenses	27,138	28,888
Aircraft and Other Flight Equipment [Member]
Property and equipment, net:
Property and equipment-gross	1,588,462	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	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	$ 302	$ 302

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