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Income and Payroll Taxes (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 29, 2020
Oct. 01, 2019
Dec. 29, 2020
Dec. 31, 2019
Income Taxes        
Cash refunds of carryback claims $ 40.0      
Payroll tax expense 8.5      
Deferred payroll taxes $ 20.5      
U.S. federal statutory rate (as a percent)     21.00% 35.00%
Benefits reflected in annual effective tax rate (as percent)     14.00%  
Tax credit carryforwards Period 20 years      
Tax credit carryforwards     $ 36.0 $ 14.3
Deferred tax asset, impairment of goodwill $ 16.4      
Effective tax rate (as a percent) 30.00% 6.20%