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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Expendable parts and supplies, net |  |
Expendable parts and supplies | $ 18,907 | $ 17,807
Less obsolescence and other | (3,249) | (2,693)
Expendable parts and supplies, net | 15,658 | 15,114
Prepaid expenses and other current assets |  |
Prepaid aircraft rent | 30,267 | 53,645
Unutilized manufacturer credits | 4,500 |
Deferred offering and reimbursed costs | 1,945 | 1,863
Other | 4,202 | 6,017
Prepaid expenses and other current assets | 40,914 | 61,525
Property and equipment-net |  |
Property and equipment-gross | 1,511,093 | 1,396,813
Less accumulated depreciation | (260,264) | (204,365)
Property and equipment-net | 1,250,829 | 1,192,448
Other accrued expenses |  |
Accrued property taxes | 6,981 | 6,484
Accrued interest | 6,118 | 4,036
Accrued vacation | 5,470 | 2,663
Accrued wheels, brakes and tires | 1,452 | 2,477
Other | 9,675 | 8,269
Other accrued expenses | 29,696 | 23,929
Aircraft and Other Flight Equipment Substantially Pledged [Member] |  |
Property and equipment-net |  |
Property and equipment-gross | 1,502,940 | 1,388,990
Other Machinery and Equipment [Member] |  |
Property and equipment-net |  |
Property and equipment-gross | 3,721 | 3,383
Leasehold Improvements [Member] |  |
Property and equipment-net |  |
Property and equipment-gross | 2,754 | 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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