Retirement Benefit Plans Defined Benefit Plans (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2011 USD ($)	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($) Pension_Plans
G&A Realignment | Termination of defined benefit plans
Defined Benefit Plan Disclosure
Restructuring and Related Cost, Incurred Cost			$ 1,335
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Defined Benefit Plans, Number of Plans | Pension_Plans			2
Defined Benefit Plan, Amortization of Prior Service Cost		$ 0
Arby's Restaurant Group, Inc | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Defined Benefit Plan, Proceeds Received from Buyer for Unfunded Liability	$ 400