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, 2018	Jan. 31, 2017
Numerator:
Net income	$ (3,691)	$ 86,588
Denominator:
Weighted-average common shares for basic net income per share (shares)	149,441	150,782
Dilutive effect of potential common shares from equity-based compensation (shares)	0	3,651
Weighted-average common shares for diluted net income per share (shares)	149,441	154,433
Net income (loss) per share:
Basic (in USD per share)	$ (0.02)	$ 0.57
Diluted (in USD per share)	$ (0.02)	$ 0.56
Anti-dilutive employee stock-based awards excluded (shares)	4,627	492