Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2022
Numerator:
Net income from continuing operations attributed to Synopsys	$ 1,441,710	$ 1,227,045	$ 970,225
Net income from discontinued operations attributed to Synopsys	821,670	2,843	14,369
Net income attributed to Synopsys	$ 2,263,380	$ 1,229,888	$ 984,594
Denominator:
Weighted average common shares for basic net income per share (shares)	153,138	152,146	153,002
Dilutive effect of common share equivalents from equity-based compensation (shares)	2,806	3,049	3,483
Weighted average common shares for diluted net income per share (shares)	155,944	155,195	156,485
Net income per share attributed to Synopsys - basic:
Continuing operations (in USD per share)	$ 9.41	$ 8.06	$ 6.34
Discontinued operations (in USD per share)	5.37	0.02	0.10
Basic net income per share (in USD per share)	14.78	8.08	6.44
Net income per share attributed to Synopsys - diluted:
Continuing operations (in USD per share)	9.25	7.91	6.20
Discontinued operations (in USD per share)	5.26	0.01	0.09
Diluted net income per share (in USD per share)	$ 14.51	$ 7.92	$ 6.29
Anti-dilutive employee stock-based awards excluded (shares)	229	475	281