Goodwill and Intangible Assets - Summary of Goodwill (Detail) $ in Thousands	3 Months Ended
	Jan. 31, 2018 USD ($)
Goodwill [Roll Forward]
As of October 31, 2017	$ 2,706,974
Additions	412,857
Goodwill, Purchase Accounting Adjustments	(81)
Effect of foreign currency translation	10,848
As of January 31, 2018	$ 3,130,598