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Credit Facilities Credit Facilities (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Debt Instrument [Line Items]          
Letters of Credit Outstanding, Amount $ 1,700,000   $ 1,700,000    
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Current Borrowing Capacity 150,000,000.0   150,000,000.0    
Line of Credit Facility, Maximum Borrowing Capacity 550,000,000.0   550,000,000.0    
Long-term Line of Credit, Noncurrent 0   0   $ 0
Interest Expense, Debt $ 100,000 $ 0.0 $ 200,000 $ 600,000