Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 663,447	$ 532,367	$ 432,518
Other comprehensive income (loss):
Change in foreign currency translation adjustment	30,466	1,360	(18,882)
Cash flow hedges:
Deferred gains (losses), net of tax of $(3,192), $(2,009), and $4,675 for fiscal years 2020, 2019 and 2018, respectively	7,834	4,733	(17,428)
Reclassification adjustment on deferred (gains) losses included in net income, net of tax of $176, $(3,672), and $2,207 for fiscal years 2020, 2019 and 2018, respectively	73	14,637	(10,888)
Other comprehensive income (loss), net of tax effects	38,373	20,730	(47,198)
Comprehensive income	701,820	553,097	385,320
Less: Net income (loss) attributed to non-controlling interest	(900)	0	0
Comprehensive income attributed to Synopsys	$ 702,720	$ 553,097	$ 385,320