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Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |
Impairment true-up adjustment gain | $ 100 |  |  |  |
Depreciation expense | 3,400 | $ 9,700 | $ 17,300 | $ 32,800 |
Investments in equity securities | $ 350 |  | $ 350 |  | $ 300

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