Net Income per Share - Reconciliation of Weighted Average Common Shares Used to Calculate Basic Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 86,588	$ 60,035
Weighted-average common shares for basic net income per share (shares)	150,782	152,968
Dilutive effect of potential common shares from equity-based compensation (shares)	3,651	2,315
Weighted-average common shares for diluted net income per share (shares)	154,433	155,283
Basic (in USD per share)	$ 0.57	$ 0.39
Diluted (in USD per share)	$ 0.56	$ 0.39
Anti-dilutive employee stock-based awards excluded (shares)	492	2,441