Reconciliation of Wendy's International Segment Operating Profit (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Segment Reporting Information [Line Items]
Revenues	$ 2,246,492	$ 2,181,578	$ 2,095,505
Cost of sales	783,211	794,493	773,169
Advertising funds expense	478,136	428,003	430,760
General and administrative	255,208	249,964	254,979
Operating profit	371,359	381,984	353,314
Advertising funds surplus (deficit)	2,702	4,344	(8,325)
Operating Segments
Segment Reporting Information [Line Items]
Operating profit	677,809	667,540	619,630
Wendy's International | Operating Segments
Segment Reporting Information [Line Items]
Revenues	144,690	130,548	106,705
Cost of sales	27,946	27,343	16,425
Advertising funds expense	39,330	35,604	30,944
General and administrative	26,048	26,226	26,643
Other segment items	8,098	5,671	2,261
Operating profit	43,268	35,704	30,432
Advertising funds surplus (deficit)	1,919	2,401	4,116
Advertising Expense	$ 827	$ 950	$ 1,099