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Fair Value Measurements (Fair Value of Financial Instruments) (Details) - Fixed rate Senior Notes due 2021 - USD ($)
$ in Millions
Dec. 28, 2019
Dec. 29, 2018
Jun. 02, 2011
Fair Value of Financial Instruments [Line Items]      
Stated interest rate     4.75%
Long-term Debt $ 599.8 $ 599.7  
Significant Other Observable Inputs (Level 2)      
Fair Value of Financial Instruments [Line Items]      
Long-term Debt, Fair Value $ 605.8