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Retirement Plans - Summary of Net Pension and SERP Expense Recognized (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]      
Service cost pertaining to benefits earned during the year $ 7.2 $ 6.5 $ 9.0
Interest cost on projected benefit obligations 17.7 19.1 18.5
Expected return on pension assets (19.8) (20.1) (20.5)
Net amortization loss 9.8 5.0 20.9
Settlement gain 0.0 (0.1) 0.0
Net pension expense 14.9 10.4 27.9
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net pension expense 9.4 4.6 20.1
SERP [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net pension expense $ 5.5 $ 5.8 $ 7.8