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Fair Value Assets - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value | $ 437,273 | $ 392,592
Debt Securities, Available-for-sale, Amortized Cost | 437,273 | 398,852
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (100)
Debt Securities, Available-for-Sale | 437,273 | 398,752
Debt Securities, Available-for-sale, Current | 0 | 6,160
Debt Securities, Available-for-sale, Noncurrent | 0 | 0
Equity Securities, FV-NI | 8,580 | 5,068
Equity Securities, FV-NI, Current | 0 | 0
Equity Securities, FV-NI, Noncurrent | 8,580 | 5,068
Investments, Fair Value Disclosure | 445,853 | 403,820
Short-term investments | 0 | 6,160
Long-term investments | 8,580 | 5,068
Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value | 437,273 | 392,592
Corporate Bonds And Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 4,412
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (88)
Municipal Bonds And Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 1,108
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (9)
US Government Agencies Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 740
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (3)
Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities, FV-NI | 8,580 | 5,068
Equity Securities, FV-NI, Current | 0 | 0
Equity Securities, FV-NI, Noncurrent | 8,580 | 5,068
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 | $ 437,273 | 392,592
Fair Value, Recurring [Member] | Level 2 | Corporate Bonds And Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value |  | 0
Debt Securities, Available-for-Sale |  | 4,324
Debt Securities, Available-for-sale, Current |  | 4,324
Debt Securities, Available-for-sale, Noncurrent |  | 0
Fair Value, Recurring [Member] | Level 2 | Municipal Bonds And Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value |  | 0
Debt Securities, Available-for-Sale |  | 1,099
Debt Securities, Available-for-sale, Current |  | 1,099
Debt Securities, Available-for-sale, Noncurrent |  | 0
Fair Value, Recurring [Member] | Level 2 | US Government Agencies Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents, fair value |  | 0
Debt Securities, Available-for-Sale |  | 737
Debt Securities, Available-for-sale, Current |  | 737
Debt Securities, Available-for-sale, Noncurrent |  | $ 0

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