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Concentrations of Credit Risk - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Concentration Risk [Line Items] |  |  |  |  |
Restricted cash | $ 2,983,000 |  | $ 2,983,000 |  | $ 3,132,000
Outstanding letters of credit to be collateralized by amounts on deposit | 3,000,000 |  | 3,000,000 |  |
Allowance for doubtful accounts | $ 0 |  | $ 0 |  | $ 0
Sales Revenue, Net [Member] | American Airlines Inc. [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 0.00% | 1.00% | 0.00% | 31.00% |
Sales Revenue, Net [Member] | United [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 98.00% | 96.00% | 97.00% | 65.00% |

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