Unaudited Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total		Cumulative Effect, Period of Adoption, Adjustment	[1]	Common Stock	Capital in Excess of Par Value	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total  Synopsys Stockholders’ Equity	Total  Synopsys Stockholders’ Equity Cumulative Effect, Period of Adoption, Adjustment	Non-controlling Interest
Balance (in shares) at Oct. 31, 2020					152,618
Beginning balance at Oct. 31, 2020	$ 4,912,367				$ 1,528	$ 1,653,166	$ 3,795,397			$ (488,613)	$ (54,074)	$ 4,907,404		$ 4,963
Beginning balance (Retained earnings adjustment due to adoption of ASC 326) at Oct. 31, 2020			$ (3,200)					$ (3,200)					$ (3,200)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	555,222						556,069					556,069		(847)
Other comprehensive income (loss), net of tax effects	$ 5,663										5,663	5,663
Purchases of treasury stock (in shares)	(2,114)	[2]			(2,114)
Purchases of treasury stock	$ (538,082)	[2]			$ (21)	21				(538,082)		(538,082)
Equity forward contract, net	$ (35,000)					(35,000)						(35,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	2,093	[2]			2,093
Common stock issued, net of shares withheld for employee taxes	$ 9,636				$ 19	(259,737)				269,354		9,636
Stock-based compensation	248,530					248,530						248,530
Balance (in shares) at Jul. 31, 2021					152,597
Ending balance at Jul. 31, 2021	5,155,136				$ 1,526	1,606,980	4,348,266			(757,341)	(48,411)	5,151,020		4,116
Balance (in shares) at Apr. 30, 2021					152,554
Beginning balance at Apr. 30, 2021	5,092,505				$ 1,526	1,679,801	4,149,620			(701,457)	(41,355)	5,088,135		4,370
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	198,392						198,646					198,646		(254)
Other comprehensive income (loss), net of tax effects	$ (7,056)										(7,056)	(7,056)
Purchases of treasury stock (in shares)	(521)	[2]			(521)
Purchases of treasury stock	$ (140,000)	[2]			$ (5)	5				(140,000)		(140,000)
Equity forward contract, net	$ (35,000)					(35,000)						(35,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	564	[2]			564
Common stock issued, net of shares withheld for employee taxes	$ (38,867)				$ 5	(122,988)				84,116		(38,867)
Stock-based compensation	85,162					85,162						85,162
Balance (in shares) at Jul. 31, 2021					152,597
Ending balance at Jul. 31, 2021	5,155,136				$ 1,526	1,606,980	4,348,266			(757,341)	(48,411)	5,151,020		4,116
Balance (in shares) at Oct. 31, 2021					153,062
Beginning balance at Oct. 31, 2021	5,298,943				$ 1,531	1,576,363	4,549,713			(782,866)	(49,604)	5,295,137		3,806
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	830,100						831,094					831,094		(994)
Other comprehensive income (loss), net of tax effects	$ (105,889)										(105,889)	(105,889)
Purchases of treasury stock (in shares)	(2,400)	[3]			(2,400)
Purchases of treasury stock	$ (752,266)	[3]			$ (24)	24				(752,266)		(752,266)
Equity forward contract, net	$ (5,000)					(5,000)						(5,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	2,342	[3]			2,342
Common stock issued, net of shares withheld for employee taxes	$ 12,022				$ 23	(488,292)				500,291		12,022
Stock-based compensation	333,437					332,149						332,149		1,288
Adjustments to redeemable non-controlling interest	(3,221)						(3,221)					(3,221)
Balance (in shares) at Jul. 31, 2022					153,004
Ending balance at Jul. 31, 2022	5,608,126				$ 1,530	1,415,244	5,377,586			(1,034,841)	(155,493)	5,604,026		4,100
Balance (in shares) at Apr. 30, 2022					152,955
Beginning balance at Apr. 30, 2022	5,567,430				$ 1,530	1,517,481	5,157,633			(999,234)	(113,099)	5,564,311		3,119
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	222,319						222,626					222,626		(307)
Other comprehensive income (loss), net of tax effects	$ (42,394)										(42,394)	(42,394)
Purchases of treasury stock (in shares)	(715)	[3]			(715)
Purchases of treasury stock	$ (217,266)	[3]			$ (8)	8				(217,266)		(217,266)
Equity forward contract, net	$ (40,000)					(40,000)						(40,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	764	[3]			764
Common stock issued, net of shares withheld for employee taxes	$ (6,895)				$ 8	(188,562)				181,659		(6,895)
Stock-based compensation	127,605					126,317						126,317		1,288
Adjustments to redeemable non-controlling interest	(2,673)						(2,673)					(2,673)
Balance (in shares) at Jul. 31, 2022					153,004
Ending balance at Jul. 31, 2022	$ 5,608,126				$ 1,530	$ 1,415,244	$ 5,377,586			$ (1,034,841)	$ (155,493)	$ 5,604,026		$ 4,100

[1] At the beginning of fiscal 2021, we adopted the Accounting Standards Codification (ASC) 326, Measurement of Credit Losses on Financial Instruments, issued by the Financial Accounting Standards Board (FASB). ASC 326 replaced the incurred loss methodology with an expected loss methodology.

[2] Excluded the 99,573 shares and $35.0 million equity forward contract from the June 2021 ASR settled in August 2021.

[3] Excluded the 101,821 shares and $40.0 million equity forward contract from the May 2022 ASR settled in August 2022.