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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 22,802 | $ 18,907
Less: obsolescence and other | (3,573) | (3,249)
Expendable parts and supplies, net | 19,229 | 15,658
Prepaid expenses and other current assets: |  |
Prepaid aircraft rent | 36,736 | 30,267
Unutilized manufacturer credits | 3,000 | 4,500
Deferred offering and reimbursed costs | 2,242 | 1,945
Other | 5,473 | 4,202
Prepaid expenses and other current assets | 47,451 | 40,914
Property and equipment, net: |  |
Property and equipment-gross | 1,532,101 | 1,511,093
Less: accumulated depreciation | (294,486) | (260,264)
Property and equipment-net | 1,237,615 | 1,250,829
Other accrued expenses: |  |
Accrued property taxes | 5,415 | 6,981
Accrued interest | 4,922 | 6,118
Accrued vacation | 5,596 | 5,470
Accrued wheels, brakes and tires | 2,479 | 1,452
Other | 8,932 | 9,675
Other accrued expenses | 27,344 | 29,696
Aircraft and Other Flight Equipment Substantially Pledged [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,522,750 | 1,502,940
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 4,631 | 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 | 898 | 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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