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, 2023	Jan. 31, 2022
Numerator:
Net income	$ 271,536	$ 313,687
Denominator:
Weighted-average common shares for basic net income per share (shares)	152,401	153,218
Dilutive effect of common share equivalents (shares)	2,675	4,055
Weighted-average common shares for diluted net income per share (shares)	155,076	157,273
Net income per share attributed to Synopsys:
Basic (in USD per share)	$ 1.78	$ 2.05
Diluted (in USD per share)	$ 1.75	$ 1.99
Anti-dilutive employee stock-based awards excluded (shares)	527	170