Summary of Significant Accounting Policies - Reconciliation of Weighted Average Common Shares Used to Calculate Basic Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 136,563	$ 266,826	$ 225,934
Weighted average common shares for basic net income per share (in shares)	150,457	152,017	154,957
Dilutive effect of common share equivalents from equity-based compensation (in shares)	4,417	2,704	3,108
Weighted average common shares for diluted net income per share (in shares)	154,874	154,721	158,065
Basic (in USD per share)	$ 0.91	$ 1.76	$ 1.46
Diluted (in USD per share)	$ 0.88	$ 1.73	$ 1.43
Anti-dilutive employee stock-based awards excluded (in shares)	345	1,971	1,363