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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 26,368 | $ 25,336
Less: obsolescence and other | (3,950) | (3,999)
Expendable parts and supplies, net | 22,418 | 21,337
Prepaid expenses and other current assets: |  |
Prepaid aircraft rent |  | 35,786
Deferred reimbursed costs | 1,387 | 2,092
Other | 5,756 | 3,045
Prepaid expenses and other current assets | 7,143 | 40,923
Property and equipment, net: |  |
Property and equipment-gross | 1,607,966 | 1,592,043
Less: accumulated depreciation | (374,239) | (318,458)
Property and equipment-net | 1,233,727 | 1,273,585
Other accrued expenses: |  |
Accrued property taxes | 9,035 | 9,186
Accrued interest | 5,941 | 4,497
Accrued vacation | 5,767 | 6,128
Deferred revenue-current portion | 3,760 |
Other | 13,160 | 9,077
Other accrued expenses | 37,663 | 28,888
Aircraft and Other Flight Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 1,597,916 | 1,582,199
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 5,323 | 5,122
Leasehold Improvements [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 2,763 | 2,797
Vehicles [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 962 | 924
Building [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 699 | 699
Furniture and Fixtures [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | $ 303 | $ 302

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