Business Combinations and Acquisition of Non-controlling Interest (Total Purchase Consideration and Preliminary Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Mar. 24, 2014	Oct. 31, 2014		Oct. 31, 2013	Oct. 31, 2012
Business Acquisition [Line Items]
Goodwill		$ 2,255,708	[1]	$ 1,975,971	$ 1,976,987
Coverity Inc
Business Acquisition [Line Items]
Total cash consideration	375,500
Goodwill	266,423
Identifiable intangibles assets acquired	101,900	101,900
Other tangible assets acquired, net	28,447
Deferred revenue	(21,270)	(21,270)
Total purchase price allocation	$ 375,500

[1] There is no accumulated impairment of goodwill for periods presented.