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Business Combinations - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2021 | Jan. 22, 2021 | Sep. 30, 2021
Threat Stack, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Total Purchase Price | $ 68.9 |  |
Identifiable Intangible Assets Useful Life | 5 years |  |
Volterra, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Total Purchase Price |  | $ 427.2 |
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 |  |  | $ 9.5
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 |
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 |

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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 -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479405/805-10-25-23 + Details
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