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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Expendable parts and supplies, net
Expendable parts and supplies	$ 18,687	$ 17,807
Less obsolescence and warranty reserve	(2,971)	(2,693)
Expendable parts and supplies, net	15,716	15,114
Prepaid expenses and other current assets
Prepaid aircraft rent	27,195	53,645
Unutilized manufacturer credits	3,000
Deferred offering and reimbursed costs	3,992	1,863
Other	5,315	6,017
Prepaid expenses and other current assets	39,502	61,525
Property and equipment-net
Property and equipment-gross	1,483,739	1,396,813
Less accumulated depreciation	(244,191)	(204,365)
Property and equipment-net	1,239,548	1,192,448
Other accrued expenses
Accrued property taxes	5,671	6,484
Accrued interest	7,181	4,036
Accrued vacation	5,155	2,663
Accrued wheels, brakes and tires	1,406	2,477
Other	9,236	8,269
Other accrued expenses	28,649	23,929
Aircraft and Other Flight Equipment Substantially Pledged [Member]
Property and equipment-net
Property and equipment-gross	1,475,572	1,388,990
Other Machinery and Equipment [Member]
Property and equipment-net
Property and equipment-gross	3,743	3,383
Leasehold Improvements [Member]
Property and equipment-net
Property and equipment-gross	2,746	2,746
Vehicles [Member]
Property and equipment-net
Property and equipment-gross	692	744
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	$ 251

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