Business Combinations - Schedule of Acquisition Purchase Price (Details) - USD ($) $ in Thousands		9 Months Ended
	Dec. 11, 2017	Jul. 31, 2018	Oct. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 3,138,666	$ 2,706,974
Black Duck Software
Business Acquisition [Line Items]
Cash paid		563,500
Fair value of assumed equity awards allocated to purchase consideration		1,588
Total consideration	$ 565,100	565,088
Goodwill		396,346
Identifiable intangibles assets acquired		178,000
Cash, cash equivalents and short-term investments		19,491
Other tangible liabilities acquired, net		(13,249)
Deferred revenue		(15,500)
Total purchase allocation		$ 565,088