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Business Combinations - Purchase Price Allocation (Details) - USD ($) | Oct. 01, 2021 | Jan. 22, 2021 | Jan. 24, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
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Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Goodwill |  |  |  | $ 2,259,282,000 | $ 2,216,553,000 | $ 1,858,966,000
Threat Stack, Inc. |  |  |  |  |  |
AssetsAcquiredAbstract [Abstract] |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ 911,000 |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Deferred tax assets | 14,036,000 |  |  |  |  |
Other tangible assets acquired, at fair value | $ 5,481,000 |  |  |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |  |  |
Goodwill | $ 43,287,000 |  |  |  |  |
Total assets acquired | 79,515,000 |  |  |  |  |
Liabilities assumed |  |  |  |  |  |
Deferred revenue | (10,591,000) |  |  |  |  |
Total liabilities assumed | (10,591,000) |  |  |  |  |
Net assets acquired | 68,924,000 |  |  |  |  |
Threat Stack, Inc. | Developed Technology Rights |  |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Identifiable intangible assets: | $ 11,400,000 |  |  |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |  |  |
Threat Stack, Inc. | Customer Relationships |  |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Identifiable intangible assets: | $ 4,400,000 |  |  |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |  |  |
Volterra, Inc. |  |  |  |  |  |
AssetsAcquiredAbstract [Abstract] |  |  |  |  |  |
Cash, cash equivalents, and restricted cash |  | $ 14,012,000 |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Other tangible assets acquired, at fair value |  | $ 7,499,000 |  |  |  |
Identifiable Intangible Assets Useful Life |  | 6 years 11 months 12 days |  |  |  |
Goodwill |  | $ 350,863,000 |  |  |  |
Total assets acquired |  | 432,374,000 |  |  |  |
Liabilities assumed |  |  |  |  |  |
Total liabilities assumed |  | (5,233,000) |  |  |  |
Net assets acquired |  | 427,141,000 |  |  |  |
Volterra, Inc. | Developed Technology Rights |  |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Identifiable intangible assets: |  | $ 59,500,000 |  |  |  |
Identifiable Intangible Assets Useful Life |  | 7 years |  |  |  |
Volterra, Inc. | Customer Relationships |  |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Identifiable intangible assets: |  | $ 500,000 |  |  |  |
Identifiable Intangible Assets Useful Life |  | 1 year |  |  |  |
Shape Security, Inc. |  |  |  |  |  |
AssetsAcquiredAbstract [Abstract] |  |  |  |  |  |
Cash, cash equivalents, and restricted cash |  |  | $ 53,934,000 |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Accounts receivable |  |  | 21,077,000 |  |  |
Deferred tax assets |  |  | 29,848,000 |  |  |
Operating lease right-of-use assets |  |  | 29,644,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | $ 22,571,000 |  |  |
Identifiable Intangible Assets Useful Life |  |  | 6 years 6 months |  |  |
Goodwill |  |  | $ 798,867,000 |  |  |
Total assets acquired |  |  | 1,106,441,000 |  |  |
Liabilities assumed |  |  |  |  |  |
Deferred revenue |  |  | (39,000,000) |  |  |
Operating lease liabilities |  |  | (30,773,000) |  |  |
Other assumed liabilities |  |  | (18,571,000) |  |  |
Total liabilities assumed |  |  | (88,344,000) |  |  |
Net assets acquired |  |  | 1,018,097,000 |  |  |
Shape Security, Inc. | Developed Technology Rights |  |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Identifiable intangible assets: |  |  | $ 120,000,000 |  |  |
Identifiable Intangible Assets Useful Life |  |  | 7 years |  |  |
Shape Security, Inc. | Customer Relationships |  |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Identifiable intangible assets: |  |  | $ 21,000,000 |  |  |
Identifiable Intangible Assets Useful Life |  |  | 4 years |  |  |
Shape Security, Inc. | Trade Names |  |  |  |  |  |
Fair Value of intangible Assets Abstract [Abstract] |  |  |  |  |  |
Identifiable intangible assets: |  |  | $ 9,500,000 |  |  |
Identifiable Intangible Assets Useful Life |  |  | 5 years |  |  |

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