Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Numerator:
Net income from continuing operations attributed to Synopsys	$ 425,868	$ 335,708	$ 1,162,429	$ 880,994
Net income (loss) from discontinued operations attributed to Synopsys	(17,813)	544	(13,155)	(296)
Net Income (Loss)	$ 408,055	$ 336,252	$ 1,149,274	$ 880,698
Denominator:
Weighted-average common shares for basic net income per share (shares)	153,417	152,023	152,885	152,204
Dilutive effect of common share equivalents from equity-based compensation (shares)	2,714	2,924	2,978	2,915
Weighted-average common shares for diluted net income per share (shares)	156,131	154,947	155,863	155,119
Net income (loss) per share attributed to Synopsys - basic:
Continuing operations (in USD per share)	$ 2.78	$ 2.21	$ 7.60	$ 5.79
Discontinued operations (in USD per share)	(0.12)	0	(0.08)	0
Basic net income per share (in USD per share)	2.66	2.21	7.52	5.79
Net income (loss) per share attributed to Synopsys - diluted:
Continuing operations (in USD per share)	2.73	2.17	7.46	5.68
Discontinued operations (in USD per share)	(0.12)	0	(0.09)	0
Diluted net income per share (in USD per share)	$ 2.61	$ 2.17	$ 7.37	$ 5.68
Anti-dilutive employee stock-based awards excluded (shares)	211	289	203	454