Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Numerator:
Net income from continuing operations attributed to Synopsys	$ 299,111	$ 275,602	$ 736,561	$ 545,286
Net income (loss) from discontinued operations attributed to Synopsys	(7,004)	(2,692)	4,658	(840)
Net Income (Loss)	$ 292,107	$ 272,910	$ 741,219	$ 544,446
Denominator:
Weighted-average common shares for basic net income per share (shares)	152,971	152,187	152,629	152,294
Dilutive effect of common share equivalents from equity-based compensation (shares)	2,799	2,543	2,981	2,750
Weighted-average common shares for diluted net income per share (shares)	155,770	154,730	155,610	155,044
Net income (loss) per share attributed to Synopsys - basic:
Continuing operations (in USD per share)	$ 1.96	$ 1.81	$ 4.83	$ 3.58
Discontinued operations (in USD per share)	(0.05)	(0.02)	0.03	(0.01)
Basic net income per share (in USD per share)	1.91	1.79	4.86	3.57
Net income (loss) per share attributed to Synopsys - diluted:
Continuing operations (in USD per share)	1.92	1.78	4.73	3.52
Discontinued operations (in USD per share)	(0.04)	(0.02)	0.03	(0.01)
Diluted net income per share (in USD per share)	$ 1.88	$ 1.76	$ 4.76	$ 3.51
Anti-dilutive employee stock-based awards excluded (shares)	208	480	202	402