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Fair Value Assets - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value | $ 642,997 | $ 437,273
Equity Securities, FV-NI | 15,693 | 8,580
Equity Securities, FV-NI, Current | 0 | 0
Equity Securities, FV-NI, Noncurrent | 15,693 | 8,580
Investments, Fair Value Disclosure | 658,690 | 445,853
Short-term investments | 0 | 0
Long-term investments | 15,693 | 8,580
Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value | 642,997 | 437,273
Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities, FV-NI | 15,693 | 8,580
Equity Securities, FV-NI, Current | 0 | 0
Equity Securities, FV-NI, Noncurrent | 15,693 | 8,580
Fair Value, Recurring [Member] | Level 1 | Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value | $ 642,997 | $ 437,273

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