Business Combinations and Acquisition of Non-controlling Interest (Magma) - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Feb. 22, 2012	Oct. 31, 2012	Oct. 31, 2014		Oct. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 1,976,987,000	$ 2,255,708,000	[1]	$ 1,975,971,000
Magma Corporation
Business Acquisition [Line Items]
Date of acquisition	Feb. 22, 2012
Acquisition price per share	$ 7.35
Total purchase consideration	550,200,000	550,200,000
Fair value of assumed equity awards allocated to purchase consideration		6,800,000
Identifiable intangibles assets acquired		184,300,000
Goodwill		316,300,000
Acquisition-related costs		$ 33,500,000
Magma Corporation | Minimum
Business Acquisition [Line Items]
Definite lived intangible asset amortization period		3 years
Magma Corporation | Maximum
Business Acquisition [Line Items]
Definite lived intangible asset amortization period		10 years

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