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Investments - Summary of Short-term, Long-term Investments and Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022
Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Short-term investments, Available-for-sale, Adjusted Basis | $ 295,699 |
Short-term investments, Available-for-sale, Gross Unrealized Gains | 0 |
Short-term investments, Available-for-sale, Gross Unrealized Losses | (2,964) |
Short-term investments, Available-for-sale, Fair Value | 292,735 | $ 0
Marketable debt securities, Adjusted Basis | 295,700 |
Net unrealized gain (loss) on held-to-maturity securities | (3,000) |
Short-term investments, Held to maturity, Adjusted Bases | 0 | 268,391
Short-term investments, Held to maturity, Gross Unrealized Gains |  | 0
Short-term investments, Held to maturity, Gross Unrealized Losses |  | (3,661)
Short-term investments, Held to maturity, Fair Value |  | 264,730
Long-term investments, Held to maturity, Adjusted Basis | 0 | 105,872
Long-term investments, Held to maturity, Gross Unrealized Gains |  | 0
Long-term investments, Held to maturity, Gross Unrealized Losses |  | (5,569)
Long-term investments, Held to maturity, Fair Value |  | 100,303
Debt securities |  |
Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Short-term investments, Available-for-sale, Adjusted Basis | 295,699 |
Short-term investments, Available-for-sale, Gross Unrealized Gains | 0 |
Short-term investments, Available-for-sale, Gross Unrealized Losses | (2,964) |
Short-term investments, Available-for-sale, Fair Value | $ 292,735 |
Short-term investments, Held to maturity, Adjusted Bases |  | 218,391
Short-term investments, Held to maturity, Gross Unrealized Gains |  | 0
Short-term investments, Held to maturity, Gross Unrealized Losses |  | (3,661)
Short-term investments, Held to maturity, Fair Value |  | 214,730
Long-term investments, Held to maturity, Adjusted Basis |  | 105,872
Long-term investments, Held to maturity, Gross Unrealized Gains |  | 0
Long-term investments, Held to maturity, Gross Unrealized Losses |  | (5,569)
Long-term investments, Held to maturity, Fair Value |  | 100,303
Certificate of deposits |  |
Schedule Of Held To Maturity Securities And Marketable Securities [Line Items] |  |
Short-term investments, Held to maturity, Adjusted Bases |  | 50,000
Short-term investments, Held to maturity, Gross Unrealized Gains |  | 0
Short-term investments, Held to maturity, Gross Unrealized Losses |  | 0
Short-term investments, Held to maturity, Fair Value |  | $ 50,000

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