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Investments - Summary of Short-term, Long-term Investments and Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Short-term investments, Held to maturity, Adjusted Bases | $ 346,046 | $ 268,391
Short-term investments, Held to maturity, Gross Unrealized Gains | 0 | 0
Short-term investments, Held to maturity, Gross Unrealized Losses | (3,755) | (3,661)
Short-term investments, Held to maturity, Fair Value | 342,291 | 264,730
Long-term investments, Held to maturity, Adjusted Basis | 78,834 | 105,872
Long-term investments, Held to maturity, Gross Unrealized Gains | 0 | 0
Long-term investments, Held to maturity, Gross Unrealized Losses | (1,709) | (5,569)
Long-term investments, Held to maturity, Fair Value | 77,125 | 100,303
Debt securities |  |
Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Short-term investments, Held to maturity, Adjusted Bases | 346,046 | 218,391
Short-term investments, Held to maturity, Gross Unrealized Gains | 0 | 0
Short-term investments, Held to maturity, Gross Unrealized Losses | (3,755) | (3,661)
Short-term investments, Held to maturity, Fair Value | 342,291 | 214,730
Long-term investments, Held to maturity, Adjusted Basis | 78,834 | 105,872
Long-term investments, Held to maturity, Gross Unrealized Gains | 0 | 0
Long-term investments, Held to maturity, Gross Unrealized Losses | (1,709) | (5,569)
Long-term investments, Held to maturity, Fair Value | 77,125 | 100,303
Certificate of deposits |  |
Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Short-term investments, Held to maturity, Adjusted Bases | 0 | 50,000
Short-term investments, Held to maturity, Gross Unrealized Gains | 0 | 0
Short-term investments, Held to maturity, Gross Unrealized Losses | 0 | 0
Short-term investments, Held to maturity, Fair Value | $ 0 | $ 50,000

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