Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 29, 2019 USD ($) years	Dec. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Management's estimate of total cost of ultimate disposition of known environmental matters | $	$ 7.7	$ 7.9
Number of years over which estimated environmental cost will be paid | years	10