Reconciliation of Wendy's International Segment Operating Profit (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Segment Reporting Information [Line Items]
Revenues	$ 549,516	$ 566,739	$ 1,633,917	$ 1,672,219
Cost of sales	204,259	195,638	588,949	587,637
Advertising funds expense	107,681	129,732	320,583	357,923
General and administrative	57,909	62,794	185,598	188,047
Segment profit	92,049	94,675	279,435	275,338
Advertising surplus (deficit)	(173)	(190)	(457)	(651)
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	161,934	168,073	494,700	504,214
Wendy's International | Operating Segments
Segment Reporting Information [Line Items]
Revenues	39,912	37,598	113,483	106,774
Cost of sales	8,422	7,697	22,617	20,717
Advertising funds expense	10,781	10,203	30,852	29,129
General and administrative	7,780	6,816	20,917	19,363
Other segment items	1,861	1,836	5,359	5,154
Segment profit	11,068	11,046	33,738	32,411
Advertising fund expense	191	622	533	1,387
Advertising surplus (deficit)	$ (650)	$ (170)	$ (1,769)	$ (640)