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Balance Sheet Information (Tables) | 12 Months Ended
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Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Summary of Certain Significant Amounts Included in Consolidated Balance Sheet | Certain significant amounts included in the Company's consolidated balance sheet as of September 30, 2021 and 2020, consisted of the following (in thousands):
| September 30, |  |  | September 30, |
| 2021 |  |  | 2020 |
Expendable parts and supplies, net: |  |  |  |  |  |  |
Expendable parts and supplies | $ | 29,297 |  |  | $ | 27,431 |
Less: obsolescence and other |  | (4,830 | ) |  |  | (4,460 | )
| $ | 24,467 |  |  | $ | 22,971 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Deferred offering and reimbursed costs | $ | — |  |  | $ | 1,261 |
Prepaid aviation insurance |  | 2,171 |  |  |  | 2,396 |
Other |  | 4,714 |  |  |  | 12,410 |
| $ | 6,885 |  |  | $ | 16,067 |
Property and equipment, net: |  |  |  |  |  |  |
Aircraft and other flight equipment substantially pledged | $ | 1,611,544 |  |  | $ | 1,596,174 |
Other equipment |  | 4,934 |  |  |  | 5,147 |
Leasehold improvements |  | 2,776 |  |  |  | 2,763 |
Vehicles |  | 1,184 |  |  |  | 1,032 |
Building |  | 699 |  |  |  | 699 |
Furniture and fixtures |  | 300 |  |  |  | 302 |
Total property and equipment |  | 1,621,437 |  |  |  | 1,606,117 |
Less: accumulated depreciation |  | (469,546 | ) |  |  | (393,702 | )
| $ | 1,151,891 |  |  | $ | 1,212,415 |
Other assets: |  |  |  |  |  |  |
Investments in equity securities | $ | 25,149 |  |  | $ | — |
Lease incentives |  | 10,957 |  |  |  | — |
Other |  | 15 |  |  |  | 742 |
| $ | 36,121 |  |  | $ | 742 |
Other accrued expenses: |  |  |  |  |  |  |
Accrued property taxes | $ | 8,783 |  |  | $ | 11,354 |
Accrued interest |  | 2,565 |  |  |  | 3,268 |
Accrued vacation |  | 5,936 |  |  |  | 5,975 |
Deferred PSP payments |  | — |  |  |  | 11,311 |
Other |  | 16,373 |  |  |  | 13,570 |
| $ | 33,657 |  |  | $ | 45,478 |
Other noncurrent liabilities: |  |  |  |  |  |  |
Warrant liabilities | $ | 21,964 |  |  | $ | — |
Lease incentive obligations |  | 6,358 |  |  |  | — |
Other |  | 6,269 |  |  |  | 1,409 |
| $ | 34,591 |  |  | $ | 1,409 |

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- Definition Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 3 -Paragraph i -Subsection 10 + Details
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