Goodwill and Intangible Assets - Summary of Goodwill (Detail) $ in Thousands	9 Months Ended
	Jul. 31, 2017 USD ($)
Goodwill [Roll Forward]
As of October 31, 2016	$ 2,518,245
Additions	132,694
Effect of foreign currency translation	9,741
As of July 31, 2017	$ 2,660,680