Unaudited Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 194,802	$ 109,920	$ 356,830	$ 213,981
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(3,171)	(10,965)	14,762	(4,003)
Cash flow hedges:
Deferred gains (losses), net of tax of $438 and $(967), for the three and six months ended April 30, 2021, respectively, and of $2,763 and $2,346 for each of the same periods in fiscal 2020, respectively.	1,214	(10,085)	5,307	(8,434)
Reclassification adjustment on deferred (gains) losses included in net income, net of tax of $1,463 and $2,348, respectively, for the three and six months ended April 30, 2021, respectively, and of $(32) and $(128) for each of the same periods in fiscal 2020, respectively.	(4,623)	331	(7,350)	854
Other comprehensive income (loss), net of tax effects	(6,580)	(20,719)	12,719	(11,583)
Comprehensive income	188,222	89,201	369,549	202,398
Less: net income (loss) attributed to non-controlling interest	(276)	0	(593)	0
Comprehensive income attributed to Synopsys	$ 188,498	$ 89,201	$ 370,142	$ 202,398