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Retirement Plans (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 29, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2018 $ 2.4
Fiscal 2019 1.8
Fiscal 2020 1.8
Fiscal 2021 1.7
Fiscal 2022 1.6
Fiscal 2023-2027 7.5
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2018 3.9
Fiscal 2019 3.7
Fiscal 2020 3.5
Fiscal 2021 3.3
Fiscal 2022 3.2
Fiscal 2023-2027 $ 14.2