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, 2019	Jan. 31, 2018
Numerator:
Net income (loss)	$ 153,514	$ (3,691)
Denominator:
Weighted-average common shares for basic net income per share (shares)	149,288	149,441
Dilutive effect of potential common shares from equity-based compensation (shares)	3,373	0
Weighted-average common shares for diluted net income per share (shares)	152,661	149,441
Net income (loss) per share:
Basic (in USD per share)	$ 1.03	$ (0.02)
Diluted (in USD per share)	$ 1.01	$ (0.02)
Anti-dilutive employee stock-based awards excluded (shares)	1,601	4,627