CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Total  Synopsys Stockholders’ Equity	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Balance (in shares) at Oct. 31, 2022			152,375
Beginning balance at Oct. 31, 2022	$ 5,520,526	$ 5,515,725	$ 1,524	$ 1,487,126	$ 5,534,307	$ (1,272,955)	$ (234,277)	$ 4,801
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	879,481	880,698			880,698			(1,217)
Other comprehensive income (loss), net of tax effects	$ 86,993	86,993					86,993
Purchases of treasury stock (in shares)	(2,382)		(2,382)
Purchases of treasury stock	$ (860,724)	(860,724)	$ (24)	24		(860,724)
Equity forward contract, net	$ (45,000)	(45,000)		(45,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	2,132		2,132
Common stock issued, net of shares withheld for employee taxes	$ (32,241)	(32,241)	$ 21	(603,944)	(19,108)	590,790
Stock-based compensation	421,949	418,047		418,047				3,902
Adjustments to redeemable non-controlling interest	(6,072)	(6,072)			(6,072)
Recognition of non-controlling interest upon issuance of subsidiary stock	(908)	1,129		1,129				(2,037)
Balance (in shares) at Jul. 31, 2023			152,125
Ending balance at Jul. 31, 2023	5,964,004	5,958,555	$ 1,521	1,257,382	6,389,825	(1,542,889)	(147,284)	5,449
Balance (in shares) at Apr. 30, 2023			152,251
Beginning balance at Apr. 30, 2023	5,836,945	5,831,859	$ 1,523	1,330,072	6,075,009	(1,428,748)	(145,997)	5,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	335,695	336,252			336,252			(557)
Other comprehensive income (loss), net of tax effects	$ (1,287)	(1,287)					(1,287)
Purchases of treasury stock (in shares)	(751)		(751)
Purchases of treasury stock	$ (300,000)	(300,000)	$ (8)	8		(300,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	625		625
Common stock issued, net of shares withheld for employee taxes	$ (48,597)	(48,597)	$ 6	(215,666)	(18,796)	185,859
Stock-based compensation	144,464	142,968		142,968				1,496
Adjustments to redeemable non-controlling interest	(2,640)	(2,640)			(2,640)
Recognition of non-controlling interest upon issuance of subsidiary stock	(576)							(576)
Balance (in shares) at Jul. 31, 2023			152,125
Ending balance at Jul. 31, 2023	$ 5,964,004	5,958,555	$ 1,521	1,257,382	6,389,825	(1,542,889)	(147,284)	5,449
Balance (in shares) at Oct. 31, 2023	152,053		152,053
Beginning balance at Oct. 31, 2023	$ 6,153,258	6,147,308	$ 1,521	1,276,152	6,741,699	(1,675,650)	(196,414)	5,950
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,147,120	1,149,274			1,149,274			(2,154)
Other comprehensive income (loss), net of tax effects	$ 16,302	16,302					16,302
Purchases of treasury stock (in shares)	(74)		(74)
Purchases of treasury stock	$ (45,000)	(45,000)	$ (1)	1		(45,000)
Equity forward contract, net	$ 45,000	45,000		45,000
Common stock issued, net of shares withheld for employee taxes (in shares)	1,634		1,634
Common stock issued, net of shares withheld for employee taxes	$ (134,458)	(134,458)	$ 16	(666,689)		532,215
Stock-based compensation	540,026	536,401		536,401				3,625
Adjustments to redeemable non-controlling interest	(6,929)	(6,929)			(6,929)
Recognition of non-controlling interest upon issuance of subsidiary stock	$ (947)	1,498		1,498				(2,445)
Balance (in shares) at Jul. 31, 2024	153,613		153,613
Ending balance at Jul. 31, 2024	$ 7,714,372	7,709,396	$ 1,536	1,192,363	7,884,044	(1,188,435)	(180,112)	4,976
Balance (in shares) at Apr. 30, 2024			153,204
Beginning balance at Apr. 30, 2024	7,157,798	7,153,160	$ 1,532	1,182,829	7,478,366	(1,321,554)	(188,013)	4,638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	407,272	408,055			408,055			(783)
Other comprehensive income (loss), net of tax effects	$ 7,901	7,901					7,901
Purchases of treasury stock (in shares)	0
Purchases of treasury stock	$ 0
Common stock issued, net of shares withheld for employee taxes (in shares)	409		409
Common stock issued, net of shares withheld for employee taxes	$ (37,761)	(37,761)	$ 4	(170,884)		133,119
Stock-based compensation	181,539	180,418		180,418				1,121
Adjustments to redeemable non-controlling interest	$ (2,377)	(2,377)			(2,377)
Balance (in shares) at Jul. 31, 2024	153,613		153,613
Ending balance at Jul. 31, 2024	$ 7,714,372	$ 7,709,396	$ 1,536	$ 1,192,363	$ 7,884,044	$ (1,188,435)	$ (180,112)	$ 4,976