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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Expendable parts and supplies, net:
Expendable parts and supplies	$ 22,802	$ 18,907
Less: obsolescence and other	(3,573)	(3,249)
Expendable parts and supplies, net	19,229	15,658
Prepaid expenses and other current assets:
Prepaid aircraft rent	36,736	30,267
Unutilized manufacturer credits	3,000	4,500
Deferred offering and reimbursed costs	2,242	1,945
Other	5,473	4,202
Prepaid expenses and other current assets	47,451	40,914
Property and equipment, net:
Property and equipment-gross	1,532,101	1,511,093
Less: accumulated depreciation	(294,486)	(260,264)
Property and equipment-net	1,237,615	1,250,829
Other accrued expenses:
Accrued property taxes	5,415	6,981
Accrued interest	4,922	6,118
Accrued vacation	5,596	5,470
Accrued wheels, brakes and tires	2,479	1,452
Other	8,932	9,675
Other accrued expenses	27,344	29,696
Aircraft and Other Flight Equipment Substantially Pledged [Member]
Property and equipment, net:
Property and equipment-gross	1,522,750	1,502,940
Other Machinery and Equipment [Member]
Property and equipment, net:
Property and equipment-gross	4,631	3,721
Leasehold Improvements [Member]
Property and equipment, net:
Property and equipment-gross	2,836	2,754
Vehicles [Member]
Property and equipment, net:
Property and equipment-gross	898	692
Building [Member]
Property and equipment, net:
Property and equipment-gross	699	699
Furniture and Fixtures [Member]
Property and equipment, net:
Property and equipment-gross	$ 287	$ 287

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