Employee Benefit Plans - Summary of Impact of Deferred Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Increase (reduction) to cost of revenue and operating expense	$ 29,606	$ 4,400	$ 3,701
Other income (expense), net	29,606	4,400	3,701
Net increase (decrease) to net income	$ 0	$ 0	$ 0