Reconciliation of Wendy's U.S. 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
Franchise support and other costs	17,069	16,222	33,665	30,964
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
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	177,669	175,566	332,766	336,141
Wendy's U.S. | Operating Segments
Segment Reporting Information [Line Items]
Revenues	461,142	472,591	890,756	915,438
Cost of sales	189,258	193,046	370,495	378,979
Franchise support and other costs	13,677	13,391	26,855	26,085
Advertising funds expense	101,355	110,701	193,115	209,726
General and administrative	19,619	18,666	42,043	37,992
Other segment items	74	78	112	123
Segment profit	137,159	136,709	258,136	262,533
Advertising fund expense	$ 0	$ 5,084	$ 0	$ 7,409