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	543,786	544,446			544,446			(660)
Other comprehensive income (loss), net of tax effects	$ 88,280	88,280					88,280
Purchases of treasury stock (in shares)	(1,631)		(1,631)
Purchases of treasury stock	$ (560,724)	(560,724)	$ (16)	16		(560,724)
Equity forward contract, net	$ (45,000)	(45,000)		(45,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	1,507		1,507
Common stock issued, net of shares withheld for employee taxes	$ 16,356	16,356	$ 15	(388,278)	(312)	404,931
Stock-based compensation	277,485	275,079		275,079				2,406
Adjustments to redeemable non-controlling interest	(3,432)	(3,432)			(3,432)
Recognition of non-controlling interest upon issuance of subsidiary stock	(332)	1,129		1,129				(1,461)
Balance (in shares) at Apr. 30, 2023			152,251
Ending 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
Balance (in shares) at Jan. 31, 2023			152,380
Beginning balance at Jan. 31, 2023	5,642,702	5,636,754	$ 1,524	1,292,900	5,805,843	(1,321,180)	(142,333)	5,948
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	272,544	272,910			272,910			(366)
Other comprehensive income (loss), net of tax effects	$ (3,664)	(3,664)					(3,664)
Purchases of treasury stock (in shares)	(825)		(825)
Purchases of treasury stock	$ (300,000)	(300,000)	$ (8)	8		(300,000)
Common stock issued, net of shares withheld for employee taxes (in shares)	696		696
Common stock issued, net of shares withheld for employee taxes	$ 85,869	85,869	$ 7	(106,258)	(312)	192,432
Stock-based compensation	143,258	142,293		142,293				965
Adjustments to redeemable non-controlling interest	(3,432)	(3,432)			(3,432)
Recognition of non-controlling interest upon issuance of subsidiary stock	(332)	1,129		1,129				(1,461)
Balance (in shares) at Apr. 30, 2023			152,251
Ending 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
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	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		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)
Recognition of non-controlling interest upon issuance of subsidiary stock	$ (947)	1,498		1,498				(2,445)
Balance (in shares) at Apr. 30, 2024	153,204		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
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		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)
Recognition of non-controlling interest upon issuance of subsidiary stock	$ (415)	0						(415)
Balance (in shares) at Apr. 30, 2024	153,204		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