Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Earnings Per Share [Abstract]
Net income attributed to Synopsys	$ 1,229,888	$ 984,594	$ 757,516
Weighted average common shares for basic net income per share (in shares)	152,146	153,002	152,698
Dilutive effect of common share equivalents from equity-based compensation (in shares)	3,049	3,483	4,642
Weighted average common shares for diluted net income per share (in shares)	155,195	156,485	157,340
Basic (in USD per share)	$ 8.08	$ 6.44	$ 4.96
Diluted (in USD per share)	$ 7.92	$ 6.29	$ 4.81
Anti-dilutive employee stock-based awards excluded (in shares)	475	281	408