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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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