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		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Numerator:
Net income (loss)	$ 99,929	$ 79,409	$ 371,653	$ 178,190
Denominator:
Weighted-average common shares for basic net income per share (shares)	150,123	148,490	149,708	148,760
Dilutive effect of potential common shares from equity-based compensation (shares)	4,477	4,124	4,151	4,358
Weighted-average common shares for diluted net income per share (shares)	154,600	152,614	153,859	153,118
Net income per share:
Basic (in USD per share)	$ 0.67	$ 0.53	$ 2.48	$ 1.20
Diluted (in USD per share)	$ 0.65	$ 0.52	$ 2.42	$ 1.16
Anti-dilutive employee stock-based awards excluded (shares)	152	1,063	798	774