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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Expendable parts and supplies, net
Expendable parts and supplies	$ 20,830	$ 18,907
Less obsolescence and other	(3,428)	(3,249)
Expendable parts and supplies, net	17,402	15,658
Prepaid expenses and other current assets
Prepaid aircraft rent	33,849	30,267
Unutilized manufacturer credits	4,500	4,500
Deferred offering and reimbursed costs	1,925	1,945
Other	2,744	4,202
Prepaid expenses and other current assets	43,018	40,914
Property and equipment—net
Property and equipment-gross	1,525,051	1,511,093
Less accumulated depreciation	(277,267)	(260,264)
Property and equipment-net	1,247,784	1,250,829
Other accrued expenses
Accrued property taxes	7,272	6,981
Accrued interest	7,742	6,118
Accrued vacation	5,557	5,470
Accrued wheels, brakes and tires	1,459	1,452
Other	8,987	9,675
Other accrued expenses	31,017	29,696
Aircraft and Other Flight Equipment Substantially Pledged [Member]
Property and equipment—net
Property and equipment-gross	1,516,680	1,502,940
Other Machinery and Equipment [Member]
Property and equipment—net
Property and equipment-gross	3,707	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	842	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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