Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024
Numerator:
Net income from continuing operations attributed to Synopsys	$ 349,232	$ 299,111	$ 644,915	$ 736,561
Net income (loss) from discontinued operations attributed to Synopsys	(3,900)	(7,004)	(3,900)	4,658
Net income attributed to Synopsys	$ 345,332	$ 292,107	$ 641,015	$ 741,219
Denominator:
Weighted average common shares for basic net income per share (in shares)	154,927	152,971	154,666	152,629
Dilutive effect of common share equivalents from equity-based compensation (in shares)	1,161	2,799	1,552	2,981
Weighted average common shares for diluted net income per share (in shares)	156,088	155,770	156,218	155,610
Net income (loss) per share attributed to Synopsys - basic:
Continuing operations (in USD per share)	$ 2.25	$ 1.96	$ 4.17	$ 4.83
Discontinued operations (in USD per share)	(0.02)	(0.05)	(0.03)	0.03
Basic net income per share (in USD per share)	2.23	1.91	4.14	4.86
Net income (loss) per share attributed to Synopsys - diluted:
Continuing operations (in USD per share)	2.24	1.92	4.13	4.73
Discontinued operations (in USD per share)	(0.03)	(0.04)	(0.03)	0.03
Diluted net income per share (in USD per share)	$ 2.21	$ 1.88	$ 4.10	$ 4.76
Anti-dilutive employee stock-based awards excluded (in shares)	1,897	208	413	202