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, 2019	Oct. 31, 2018	Oct. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 532,367	$ 432,518	$ 136,563
Weighted average common shares for basic net income per share (in shares)	149,872	149,036	150,457
Dilutive effect of common share equivalents from equity-based compensation (in shares)	4,318	4,357	4,417
Weighted average common shares for diluted net income per share (in shares)	154,190	153,393	154,874
Basic (in USD per share)	$ 3.55	$ 2.90	$ 0.91
Diluted (in USD per share)	$ 3.45	$ 2.82	$ 0.88
Anti-dilutive employee stock-based awards excluded (in shares)	171	850	345