Business Combinations and Acquisition of Non-controlling Interest (SpringSoft) - Additional Information (Detail)					0 Months Ended	1 Months Ended			1 Months Ended
	Oct. 31, 2014 USD ($)		Oct. 31, 2013 USD ($)	Oct. 31, 2012 USD ($)	Oct. 01, 2012 SpringSoft Inc USD ($)	Oct. 31, 2012 SpringSoft Inc USD ($)	Jan. 31, 2013 SpringSoft Inc	Oct. 01, 2012 SpringSoft Inc TWD	Oct. 31, 2012 SpringSoft Inc Minimum	Oct. 31, 2012 SpringSoft Inc Maximum
Business Acquisition [Line Items]
Acquisition price per share								57.00
Percentage of acquisition of shares							8.40%	91.60%
Cash consideration for acquisition					$ 373,500,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners								8.40%
Total purchase consideration						426,900,000
Fair value of non-controlling interest acquired						44,000,000
Fair value of equity awards allocated to purchase consideration						9,400,000
Identifiable intangibles assets acquired						107,300,000
Goodwill	2,255,708,000	[1]	1,975,971,000	1,976,987,000		257,600,000
Acquisition-related costs						$ 6,600,000
Definite lived intangible asset amortization period									3 years	8 years

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