Goodwill and Intangible Assets - Summary of Goodwill (Detail) $ in Thousands		9 Months Ended
		Jul. 31, 2015 USD ($)
Goodwill [Roll Forward]
As of October 31, 2014	[1]	$ 2,255,708
Additions		92,186
Adjustments	[2]	684
Effect of foreign currency translation		(12,762)
As of July 31, 2015		$ 2,335,816

[1] Derived from audited financial statements.

[2] Adjustments relate to changes in estimates for acquisitions that closed in the prior fiscal year for which the purchase price allocation was finalized during the reporting period.