Unaudited Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 198,392	$ 252,911	$ 555,222	$ 466,892
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(5,905)	18,102	8,857	14,099
Changes in unrealized gains (losses) on available-for-sale securities, net of tax of $0 for periods presented	15	0	15	0
Cash flow hedges:
Deferred gains (losses), net of tax of $(909) and $(1,876), for the three and nine months ended July 31, 2021, respectively, and of $(4,169) and $(1,823) for each of the same periods in fiscal 2020, respectively.	3,664	12,399	8,971	3,965
Reclassification adjustment on deferred (gains) losses included in net income, net of tax of $1,460 and $3,808, for the three and nine months ended July 31, 2021, respectively, and of $(134) and $(262) for each of the same periods in fiscal 2020, respectively.	(4,830)	709	(12,180)	1,563
Other comprehensive income (loss), net of tax effects	(7,056)	31,210	5,663	19,627
Comprehensive income	191,336	284,121	560,885	486,519
Less: net income (loss) attributed to non-controlling interest	(254)	0	(847)	0
Comprehensive income attributed to Synopsys	$ 191,590	$ 284,121	$ 561,732	$ 486,519