Commitments and Contingencies (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 28, 2021 USD ($) item	Sep. 28, 2021 USD ($) item	Dec. 29, 2020 USD ($) item
Commitments and Contingencies
Estimated cost to complete capital project commitments (in dollars) | $	$ 122.6	$ 122.6	$ 95.9
Number of suppliers providing most of the company's beef | item	3	3
Lease Agreements
Commitments and Contingencies
Number of leases guarantees entity contingently liable | item		7	7
Lease Agreements | Maximum
Commitments and Contingencies
Contingently liable amount | $	$ 12.4	$ 12.4	$ 13.0