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Debt (Narrative) (Detail)
$ in Millions
Nov. 24, 2014
USD ($)
Sep. 29, 2017
USD ($)
loan
Dec. 30, 2016
USD ($)
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 400.0    
Debt Instrument, Interest Rate, Stated Percentage   4.75%  
Long-term debt   $ 560.4 $ 489.6
Total debt   695.8 619.9
2014 Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Term 5 years    
Uncommitted Facilities [Member]      
Debt Instrument [Line Items]      
Total debt   135.0 130.0
Senior Notes [Member]      
Debt Instrument [Line Items]      
Notes Payable, Noncurrent   400.0 400.0
Revolving Credit Facility [Member] | 2014 Credit Facility [Member]      
Debt Instrument [Line Items]      
Total debt   164.0 94.0
Promissory Notes And Other Debt [Member]      
Debt Instrument [Line Items]      
Total debt   1.3 0.8
Notes Payable, Noncurrent   0.9 0.5
Revolving Credit Facility [Member] | Uncommitted Facilities [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity   $ 75.0  
Number Of Revolving Loan Facilities | loan   2  
Short-term Debt   $ 135.0 $ 130.0
Short-term Debt, Weighted Average Interest Rate, at Point in Time   2.11% 1.65%
Revolving Credit Facility [Member] | Unsecured Debt [Member] | 2014 Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity   $ 1,000.0  
Long-term Debt, Weighted Average Interest Rate, at Point in Time   2.48% 1.80%
Long-term debt   $ 164.0 $ 94.0
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity   $ 75.0