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Investments - Schedule of Short-term, Long-term Investments and Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
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Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Current investments, Available-for-sale, Adjusted Basis | $ 498,743 | $ 577,465
Current investments, Available-for-sale, Gross Unrealized Gains | 387 | 837
Current investments, Available-for-sale, Gross Unrealized Losses | (84) | (26)
Current investments, Available-for-sale, Fair Value | 499,046 | 578,276
Available-for-sale securities |  |
Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Current investments, Available-for-sale, Adjusted Basis | 498,743 | 577,465
Current investments, Available-for-sale, Gross Unrealized Gains | 387 | 837
Current investments, Available-for-sale, Gross Unrealized Losses | (84) | (26)
Current investments, Available-for-sale, Fair Value | $ 499,046 | $ 578,276

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