Net Income per Share - Reconciliation of Weighted Average Common Shares Used to Calculate Basic Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Numerator:
Net income	$ 272,910	$ 294,781	$ 544,446	$ 608,468
Denominator:
Weighted-average common shares for basic net income per share (shares)	152,187	153,090	152,294	153,154
Dilutive effect of common share equivalents (shares)	2,543	3,077	2,750	3,661
Weighted-average common shares for diluted net income per share (shares)	154,730	156,167	155,044	156,815
Net income per share attributed to Synopsys:
Basic (in USD per share)	$ 1.79	$ 1.93	$ 3.57	$ 3.97
Diluted (in USD per share)	$ 1.76	$ 1.89	$ 3.51	$ 3.88
Anti-dilutive employee stock-based awards excluded (shares)	480	1,259	402	986