Reconciliation of Wendy's International Segment Operating Profit (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2026	Mar. 30, 2025
Segment Reporting [Line Items]
Revenues	$ 540,637	$ 523,472
Cost of sales	201,049	188,169
Advertising funds expense	108,615	101,528
General and Administrative Expense	72,843	68,204
Segment profit	64,921	83,126
Advertising surplus (deficit)	(271)	144
Operating Segments
Segment Reporting [Line Items]
Segment profit	148,494	155,097
Wendy's International | Operating Segments
Segment Reporting [Line Items]
Revenues	36,927	34,721
Cost of sales	6,753	6,932
Advertising funds expense	9,071	9,912
General and Administrative Expense	8,225	6,437
Other segment items	2,299	1,996
Segment profit	10,579	9,444
Advertising fund expense	0	159
Advertising surplus (deficit)	$ (3)	$ (1,153)