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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2021 | Jan. 22, 2021 | Jan. 24, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Other Increase (Decrease) |  |  |  | $ (1,227) | $ 6,170 |
Threat Stack, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total Purchase Price | $ 68,900 |  |  |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |  |  |
Volterra, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total Purchase Price |  | $ 427,200 |  |  |  |
Identifiable Intangible Assets Useful Life |  | 6 years 11 months 12 days |  |  |  |
Volterra, Inc. | General and Administrative Expense |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 9,500 |
Shape Security, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total Purchase Price |  |  | $ 1,000,000 |  |  |
Transaction Costs |  |  | $ 23,200 |  |  |
Identifiable Intangible Assets Useful Life |  |  | 6 years 6 months |  |  |
Shape Security, Inc. | General and Administrative Expense |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 15,300
Developed Technology Rights | Threat Stack, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |  |  |
Developed Technology Rights | Volterra, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable Intangible Assets Useful Life |  | 7 years |  |  |  |
Developed Technology Rights | Shape Security, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable Intangible Assets Useful Life |  |  | 7 years |  |  |
Customer Relationships | Threat Stack, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable Intangible Assets Useful Life | 5 years |  |  |  |  |
Customer Relationships | Volterra, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable Intangible Assets Useful Life |  | 1 year |  |  |  |
Customer Relationships | Shape Security, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable Intangible Assets Useful Life |  |  | 4 years |  |  |
Trade Names | Shape Security, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable Intangible Assets Useful Life |  |  | 5 years |  |  |

X
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI https://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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