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
Beginning Balance (in shares) at Oct. 31, 2021			153,062
Beginning balance at Oct. 31, 2021	$ 5,298,943	$ 5,295,137	$ 1,531	$ 1,576,363	$ 4,549,713	$ (782,866)	$ (49,604)	$ 3,806
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	983,288	984,594			984,594			(1,306)
Other comprehensive income (loss), net of tax effects	$ (184,673)	(184,673)					(184,673)
Purchases of treasury stock (in shares)	(3,609)		(3,609)
Purchases of treasury stock	$ (1,135,000)	(1,135,000)	$ (36)	36		(1,135,000)
Equity forward contract, net	$ 35,000	35,000		35,000
Common stock issued, net of shares withheld for employee taxes (in shares)	2,922		2,922
Common stock issued, net of shares withheld for employee taxes	$ 63,939	63,939	$ 29	(581,001)		644,911
Stock-based compensation	459,029	456,728		456,728				2,301
Ending Balance (in shares) at Oct. 31, 2022			152,375
Ending 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	1,228,127	1,229,888			1,229,888			(1,761)
Other comprehensive income (loss), net of tax effects	$ 37,863	37,863					37,863
Purchases of treasury stock (in shares)	(2,992)		(2,992)
Purchases of treasury stock	$ (1,160,724)	(1,160,724)	$ (30)	30		(1,160,724)
Equity forward contract, net	$ (45,000)	(45,000)		(45,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	2,670		2,670
Common stock issued, net of shares withheld for employee taxes	$ 13,737	13,737	$ 27	(725,211)	(19,108)	758,029
Stock-based compensation	563,292	558,078		558,078				5,214
Adjustments to redeemable non-controlling interest	(3,388)	(3,388)			(3,388)
Recognition of non-controlling interest upon issuance of subsidiary stock	$ (1,175)	1,129		1,129				(2,304)
Ending Balance (in shares) at Oct. 31, 2023	152,053		152,053
Ending 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	2,257,828	2,263,380			2,263,380			(5,552)
Other comprehensive income (loss), net of tax effects	$ 16,034	16,034					16,034
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)	2,133		2,133
Common stock issued, net of shares withheld for employee taxes	$ (104,309)	(104,309)	$ 21	(799,210)		694,880
Stock-based compensation	692,316	687,765		687,765				4,551
Adjustments to redeemable non-controlling interest	(20,974)	(20,974)			(20,974)
Recognition of non-controlling interest upon issuance of subsidiary stock	$ (947)	1,498		1,498				(2,445)
Ending Balance (in shares) at Oct. 31, 2024	154,112		154,112
Ending balance at Oct. 31, 2024	$ 8,993,206	$ 8,990,702	$ 1,541	$ 1,211,206	$ 8,984,105	$ (1,025,770)	$ (180,380)	$ 2,504