Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2025	Jan. 31, 2024
Numerator:
Net income from continuing operations attributed to Synopsys	$ 295,683	$ 437,450
Net income from discontinued operations attributed to Synopsys	0	11,662
Net income attributed to Synopsys	$ 295,683	$ 449,112
Denominator:
Weighted average common shares for basic net income per share (in shares)	154,408	152,311
Dilutive effect of common share equivalents from equity-based compensation (in shares)	1,781	3,023
Weighted average common shares for diluted net income per share (in shares)	156,189	155,334
Net income per share attributed to Synopsys - basic:
Continuing operations (in USD per share)	$ 1.91	$ 2.87
Discontinued operations (in USD per share)	0	0.08
Basic net income per share (in USD per share)	1.91	2.95
Net income per share attributed to Synopsys - diluted:
Continuing operations (in USD per share)	1.89	2.82
Discontinued operations (in USD per share)	0	0.07
Diluted net income per share (in USD per share)	$ 1.89	$ 2.89
Anti-dilutive employee stock-based awards excluded (in shares)	352	702