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Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Oct. 01, 2021 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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Fair Value of intangible Assets Abstract [Abstract] |  |  |  |
Goodwill |  | $ 2,312,362 | $ 2,288,678 | $ 2,259,282
Threat Stack, Inc. |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | $ 14,041 |  |  |
Other tangible assets acquired, at fair value | 5,481 |  |  |
Cash, cash equivalents, and restricted cash | $ 911 |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |
Goodwill | $ 43,282 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total | 79,515 |  |  |
Liabilities Assumed Abstract [Abstract] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue | (10,591) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (10,591) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total | 68,924 |  |  |
Threat Stack, Inc. | Developed Technology Rights |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 11,400 |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |
Threat Stack, Inc. | Customer Relationships |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 4,400 |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |

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