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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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