Business Combinations - Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 24, 2020	May 08, 2019	Sep. 30, 2020
Business Acquisition [Line Items]
Goodwill, Other Increase (Decrease)			$ 6,024
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
F5 Networks Acquisition of Nginx
Business Acquisition [Line Items]
Total Purchase Price		$ 643,200
Transaction Costs		$ 19,000
Identifiable Intangible Assets Useful Life		8 years 1 month 6 days
Goodwill, Other Increase (Decrease)			$ 6,000
Tax Deductible Goodwill		$ 490,300
F5 Networks Acquisition of Nginx | General and Administrative Expense
Business Acquisition [Line Items]
Transaction Costs		$ 1,000
Developed Technology Rights | Shape Security Inc.
Business Acquisition [Line Items]
Identifiable Intangible Assets Useful Life	7 years
Developed Technology Rights | F5 Networks Acquisition of Nginx
Business Acquisition [Line Items]
Identifiable Intangible Assets Useful Life		7 years
Customer Relationships | Shape Security Inc.
Business Acquisition [Line Items]
Identifiable Intangible Assets Useful Life	4 years
Customer Relationships | F5 Networks Acquisition of Nginx
Business Acquisition [Line Items]
Identifiable Intangible Assets Useful Life		15 years
Trade Names | Shape Security Inc.
Business Acquisition [Line Items]
Identifiable Intangible Assets Useful Life	5 years
Trade Names | F5 Networks Acquisition of Nginx
Business Acquisition [Line Items]
Identifiable Intangible Assets Useful Life		7 years