Goodwill and Intangible Assets - Summary of Goodwill (Detail) $ in Thousands	6 Months Ended
	Apr. 30, 2017 USD ($)
Goodwill [Roll Forward]
As of October 31, 2016	$ 2,518,245
Additions	132,908
Effect of foreign currency translation	10,385
As of April 30, 2017	$ 2,661,538