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Investments - Summary of Short-term, Long-term Investments and Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
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Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Current investments, Available-for-sale, Adjusted Basis | $ 396,249 | $ 295,699
Current investments, Available-for-sale, Gross Unrealized Gains | 11 | 3
Current investments, Available-for-sale, Gross Unrealized Losses | (850) | (2,967)
Current investments, Available-for-sale, Fair Value | 395,410 | 292,735
Debt securities |  |
Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Current investments, Available-for-sale, Adjusted Basis | 396,249 | 295,699
Current investments, Available-for-sale, Gross Unrealized Gains | 11 | 3
Current investments, Available-for-sale, Gross Unrealized Losses | (850) | (2,967)
Current investments, Available-for-sale, Fair Value | $ 395,410 | $ 292,735

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