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, 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	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
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)
Deconsolidation and Recognition of non-controlling interest upon the sale and issuance of subsidiary stock	(1,175)	1,129		1,129				(2,304)
Ending Balance (in shares) at Oct. 31, 2023			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
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)
Deconsolidation and Recognition of non-controlling interest upon the sale and 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,334,090	1,332,220			1,332,220			1,870
Other comprehensive income (loss), net of tax effects	$ (52,034)	(52,034)					(52,034)
Purchases of treasury stock (in shares)	0
Purchases of treasury stock	$ 0
Common stock issued upon the acquisition of Ansys (in shares)			29,955
Common stock issued upon the acquisition of Ansys	17,105,538	17,105,538	$ 300	17,105,238
Assumption of equity awards in connection with the acquisition of Ansys	130,963	130,963		130,963
Common stock issued, net of shares withheld for employee taxes (in shares)			1,927
Common stock issued, net of shares withheld for employee taxes	(77,168)	(77,168)	$ 19	(704,679)		627,492
Stock-based compensation	893,294	892,585		892,585				709
Adjustments to redeemable non-controlling interest	(838)	(838)			(838)
Deconsolidation and Recognition of non-controlling interest upon the sale and issuance of subsidiary stock	$ (36)	5,634		5,634				(5,670)
Ending Balance (in shares) at Oct. 31, 2025	185,994		185,994
Ending balance at Oct. 31, 2025	$ 28,327,015	$ 28,327,602	$ 1,860	$ 18,640,947	$ 10,315,487	$ (398,278)	$ (232,414)	$ (587)