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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Expendable parts and supplies, net
Expendable parts and supplies	$ 27,431	$ 25,336
Less obsolescence and other	(4,460)	(3,999)
Expendable parts and supplies, net	22,971	21,337
Prepaid expenses and other current assets
Prepaid aircraft rent		35,786
Deferred offering and reimbursed costs	1,261	2,092
Other	14,806	3,045
Prepaid expenses and other current assets	16,067	40,923
Property and equipment-net
Property and equipment-gross	1,606,117	1,592,043
Less accumulated depreciation	(393,702)	(318,458)
Property and equipment-net	1,212,415	1,273,585
Other accrued expenses
Accrued property taxes	11,354	9,186
Accrued interest	3,268	4,497
Accrued vacation	5,975	6,128
Deferred revenue- current portion	9,389	1,513
Other	24,881	7,564
Other accrued expenses	54,867	28,888
Aircraft and Other Flight Equipment Substantially Pledged [Member]
Property and equipment-net
Property and equipment-gross	1,596,174	1,582,199
Other Machinery and Equipment [Member]
Property and equipment-net
Property and equipment-gross	5,147	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	1,032	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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