Goodwill and Intangible Assets - Summary of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 30, 2015
Goodwill [Roll Forward]
As of October 31, 2014	$ 2,255,708	[1]
Additions	0
Adjustments	684	[2]
Effect of foreign currency translation	(4,547)
As of April 30, 2015	$ 2,251,845

[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.