Goodwill and Intangible Assets - Summary of Goodwill (Detail) $ in Thousands	9 Months Ended
	Jul. 31, 2016 USD ($)
Goodwill [Roll Forward]
As of October 31, 2015	$ 2,471,241	[1]
Additions	39,062
Adjustments	435	[2]
Effect of foreign currency translation	4,353
As of July 31, 2016	$ 2,515,091

[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.