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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Expendable parts and supplies, net:
Expendable parts and supplies	$ 27,347	$ 27,431
Less: obsolescence and other	(4,587)	(4,460)
Expendable parts and supplies, net	22,760	22,971
Prepaid expenses and other current assets:
Deferred offering and reimbursed costs	1,129	1,261
Other	11,768	14,806
Prepaid expenses and other current assets	12,897	16,067
Property and equipment, net:
Property and equipment-gross	1,607,329	1,606,117
Less: accumulated depreciation	(413,268)	(393,702)
Property and equipment-net	1,194,061	1,212,415
Other accrued expenses:
Accrued property taxes	12,690	11,354
Accrued interest	5,149	3,268
Accrued vacation	6,143	5,975
Other	13,599	24,881
Other accrued expenses	37,581	45,478
Aircraft and Other Flight Equipment Substantially Pledged [Member]
Property and equipment, net:
Property and equipment-gross	1,597,394	1,596,174
Other Machinery and Equipment [Member]
Property and equipment, net:
Property and equipment-gross	5,176	5,147
Leasehold Improvements [Member]
Property and equipment, net:
Property and equipment-gross	2,763	2,763
Vehicles [Member]
Property and equipment, net:
Property and equipment-gross	995	1,032
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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