Accumulated Other Comprehensive Income (Loss) - Schedule of Effect of Amounts Reclassified out of Each Component of Accumulated Other Comprehensive Income (Loss) into Net Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2023
Reclassification Adjustment Balance In Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 7,054,178	$ 6,127,436	$ 5,318,014
Operating expenses	(4,515,702)	(3,526,436)	(3,013,932)
Interest expense	(446,729)	(36,829)	(2,703)
Net income attributed to Synopsys	1,332,220	2,263,380	1,229,888
Reclassifications: | Unrealized gains (losses) on derivative instruments, net of taxes
Reclassification Adjustment Balance In Accumulated Other Comprehensive Income [Line Items]
Revenue	3,155	3,089	(9,942)
Operating expenses	(3,320)	112	(15,334)
Interest expense	(3,551)	0	0
Net income attributed to Synopsys	$ (3,716)	$ 3,201	$ (25,276)