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
Beginning balance (in shares) at Oct. 31, 2023			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	739,848	741,219			741,219			(1,371)
Other comprehensive income (loss), net of tax effects	$ 8,401	8,401					8,401
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)			1,225
Common stock issued, net of shares withheld for employee taxes	(96,697)	(96,697)	$ 12	(495,805)		399,096
Stock-based compensation	358,487	355,983		355,983				2,504
Adjustments to redeemable non-controlling interest	(4,552)	(4,552)			(4,552)
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 Apr. 30, 2024			153,204
Ending 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
Beginning balance (in shares) at Jan. 31, 2024			152,536
Beginning balance at Jan. 31, 2024	6,675,574	6,670,984	$ 1,525	1,183,473	7,188,550	(1,539,340)	(163,224)	4,590
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	291,380	292,107			292,107			(727)
Other comprehensive income (loss), net of tax effects	$ (24,789)	(24,789)					(24,789)
Purchases of treasury stock (in shares)	0
Purchases of treasury stock	$ 0
Common stock issued, net of shares withheld for employee taxes (in shares)			668
Common stock issued, net of shares withheld for employee taxes	40,504	40,504	$ 7	(177,289)		217,786
Stock-based compensation	177,835	176,645		176,645				1,190
Adjustments to redeemable non-controlling interest	(2,291)	(2,291)			(2,291)
Deconsolidation and Recognition of non-controlling interest upon the sale and issuance of subsidiary stock	(415)	0						(415)
Ending balance (in shares) at Apr. 30, 2024			153,204
Ending 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
Beginning balance (in shares) at Oct. 31, 2024	154,112		154,112
Beginning 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	643,359	641,015			641,015			2,344
Other comprehensive income (loss), net of tax effects	$ (59,756)	(59,756)					(59,756)
Purchases of treasury stock (in shares)	0
Purchases of treasury stock	$ 0
Common stock issued, net of shares withheld for employee taxes (in shares)			1,034
Common stock issued, net of shares withheld for employee taxes	(48,516)	(48,516)	$ 11	(385,296)		336,769
Stock-based compensation	388,186	387,477		387,477				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 Apr. 30, 2025	155,146		155,146
Ending balance at Apr. 30, 2025	$ 9,915,605	9,915,718	$ 1,552	1,219,021	9,624,282	(689,001)	(240,136)	(113)
Beginning balance (in shares) at Jan. 31, 2025			154,618
Beginning balance at Jan. 31, 2025	9,304,901	9,304,792	$ 1,547	1,127,181	9,278,950	(860,967)	(241,919)	109
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	345,110	345,332			345,332			(222)
Other comprehensive income (loss), net of tax effects	$ 1,783	1,783					1,783
Purchases of treasury stock (in shares)	0
Purchases of treasury stock	$ 0
Common stock issued, net of shares withheld for employee taxes (in shares)			528
Common stock issued, net of shares withheld for employee taxes	62,088	62,088	$ 5	(109,883)		171,966
Stock-based compensation	$ 201,723	201,723		201,723
Ending balance (in shares) at Apr. 30, 2025	155,146		155,146
Ending balance at Apr. 30, 2025	$ 9,915,605	$ 9,915,718	$ 1,552	$ 1,219,021	$ 9,624,282	$ (689,001)	$ (240,136)	$ (113)