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Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Oct. 01, 2021 | Jan. 22, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |
Goodwill |  |  | $ 2,288,678 | $ 2,259,282 | $ 2,216,553
Threat Stack, Inc. |  |  |  |  |
AssetsAcquiredAbstract [Abstract] |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ 911 |  |  |  |
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 |  |  |  |
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 |  |  |  |
Volterra, Inc. |  |  |  |  |
AssetsAcquiredAbstract [Abstract] |  |  |  |  |
Cash, cash equivalents, and restricted cash |  | $ 14,012 |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |
Other tangible assets acquired, at fair value |  | $ 7,499 |  |  |
Identifiable Intangible Assets Useful Life |  | 6 years 11 months 12 days |  |  |
Goodwill |  | $ 350,863 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total |  | 432,374 |  |  |
Liabilities Assumed Abstract [Abstract] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | (5,233) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total |  | 427,141 |  |  |
Volterra, Inc. | Developed Technology Rights |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 59,500 |  |  |
Identifiable Intangible Assets Useful Life |  | 7 years |  |  |
Volterra, Inc. | Customer Relationships |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 500 |  |  |
Identifiable Intangible Assets Useful Life |  | 1 year |  |  |

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