Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2024	Jan. 31, 2023
Numerator:
Net income	$ 449,112	$ 271,536
Denominator:
Weighted-average common shares for basic net income per share (shares)	152,311	152,401
Dilutive effect of common share equivalents from equity-based compensation (shares)	3,023	2,675
Weighted-average common shares for diluted net income per share (shares)	155,334	155,076
Net income per share attributed to Synopsys:
Basic (in USD per share)	$ 2.95	$ 1.78
Diluted (in USD per share)	$ 2.89	$ 1.75
Anti-dilutive employee stock-based awards excluded (shares)	702	527