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Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Sep. 30, 2025
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |  |
Cash equivalents, fair value | $ 828,013 | $ 642,997
Equity Securities, FV-NI | 21,991 | 15,693
Equity Securities, FV-NI, Current | 0 | 0
Equity Securities, FV-NI, Noncurrent | 21,991 | 15,693
Investments, Fair Value Disclosure | 850,004 | 658,690
Short-Term Investments | 0 | 0
Long-Term Investments | 21,991 | 15,693
Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |  |
Equity Securities, FV-NI | 21,991 | 15,693
Equity Securities, FV-NI, Current | 0 | 0
Equity Securities, FV-NI, Noncurrent | 21,991 | 15,693
Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |  |
Cash equivalents, fair value | 828,013 | 642,997
Money Market Funds | Fair Value, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |  |
Cash equivalents, fair value | $ 828,013 | $ 642,997

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