Reconciliation of Wendy's International Segment Operating Profit (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenues	$ 560,929	$ 570,727	$ 1,084,401	$ 1,105,480
Cost of sales	196,521	199,886	384,690	391,999
Advertising funds expense	111,374	120,817	212,902	228,191
General and administrative	59,485	61,496	127,689	125,253
Segment profit	104,260	99,507	187,386	180,663
Advertising surplus (deficit)	(140)	(254)	(284)	(461)
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	177,669	175,566	332,766	336,141
Wendy's International | Operating Segments
Segment Reporting Information [Line Items]
Revenues	38,850	36,361	73,571	69,176
Cost of sales	7,263	6,840	14,195	13,020
Advertising funds expense	10,159	10,370	20,071	18,926
General and administrative	6,700	6,606	13,137	12,547
Other segment items	1,502	1,870	3,498	3,318
Segment profit	13,226	10,675	22,670	21,365
Advertising fund expense	183	603	342	765
Advertising surplus (deficit)	$ 34	$ (320)	$ (1,119)	$ (470)