Business Combinations and Acquisition of Non-controlling Interest (Acquisition of Coverity, Inc. (Coverity)) - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
	Oct. 31, 2014 acquisition	Mar. 24, 2014
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of acquisitions completed	4
Coverity Inc
Business Acquisition [Line Items]
Date of acquisition		Mar. 24, 2014
Total cash consideration		$ 375,500,000
Acquired deferred revenue	68,500,000
Deferred revenue	21,270,000	21,270,000
Goodwill, not deductible for tax purposes	266,400,000
Identifiable intangibles assets acquired	101,900,000	101,900,000
Fair value of stock options assumed	15,000,000
Minimum | Coverity Inc
Business Acquisition [Line Items]
Definite lived intangible asset amortization period	2 years
Maximum | Coverity Inc
Business Acquisition [Line Items]
Definite lived intangible asset amortization period	8 years