Business Combinations - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Dec. 11, 2017	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2017
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash, cash equivalents and short-term investments		$ 595,900
Goodwill		3,130,598		$ 2,706,974
Payment to acquire business net of cash acquired		608,344	$ 187,624
Black Duck Software
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash, cash equivalents and short-term investments		544,000
Consideration transfered	$ 565,088
Goodwill	396,914	396,900
Identifiable intangibles assets acquired	178,000	178,000
Acquisition-related costs		11,600
Fair value of equity awards acquired		15,600
Fair value of assumed equity awards allocated to purchase consideration	$ 1,588	1,600
Fair value of stock options assumed		14,000
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Payment to acquire business net of cash acquired		$ 51,900
Minimum | Black Duck Software
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life		1 year
Maximum | Black Duck Software
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life		10 years