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Short-term and Long-term Debt - Narratve (Detail)
 12 Months Ended
Mar. 22, 2018
USD ($)
Feb. 20, 2018
USD ($)
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule Of Debt Instruments [Line Items]          
Long-term debt and notes payable maturity, 2019     $ 186,300,000    
Long-term debt and notes payable maturity, 2020     0    
Long-term debt and notes payable maturity, 2021     250,000,000    
Long-term debt and notes payable maturity, 2022     0    
Long-term debt and notes payable maturity, 2023     $ 0    
Weighted-average interest rate     3.21% 2.34%  
Loss on early extinguishment of debt     $ 7,800,000 $ 0 $ 0
Proceeds from sale of unsecured long-term notes     395,400,000 297,800,000 $ 0
Notes Payable          
Schedule Of Debt Instruments [Line Items]          
Average debt instrument amount outstanding     $ 167,700,000 $ 126,800,000  
Weighted-average interest rate     2.84% 2.45%  
Commercial Paper          
Schedule Of Debt Instruments [Line Items]          
Average debt instrument amount outstanding     $ 154,900,000 $ 103,300,000  
Weighted-average interest rate     2.03% 1.14%  
Unsecured Notes Due 2019          
Schedule Of Debt Instruments [Line Items]          
Debt instrument, face amount   $ 200,000,000      
Unsecured notes, interest rate   6.70%      
Notes 2019          
Schedule Of Debt Instruments [Line Items]          
Debt repurchase amount   $ 26,100,000      
Payment for debt extinguishment $ 209,100,000        
Interest expense 1,500,000        
Loss on early extinguishment of debt $ 7,800,000        
4.10% unsecured notes due 2048          
Schedule Of Debt Instruments [Line Items]          
Debt instrument, face amount   $ 400,000,000      
Unsecured notes, interest rate   4.10% 4.10%    
Proceeds from sale of unsecured long-term notes   $ 395,400,000      
Transaction costs   $ 3,500,000      
Five-year Multi-Currency Revolving Credit Facility          
Schedule Of Debt Instruments [Line Items]          
Debt maturity term     5 years    
Revolving credit facility, amount available     $ 700,000,000    
Revolving credit facility, outstanding amount     $ 0    
Actual debt-to-capital ratio     0.23    
Actual debt-to-income ratio     0.99    
Five-year Multi-Currency Revolving Credit Facility | Maximum          
Schedule Of Debt Instruments [Line Items]          
Maximum limit of required debt-to-capital ratio     0.6    
Maximum limit of required debt-to-income ratio     3.5    
Five-year Multi-Currency Revolving Credit Facility | Maximum | Material Acquisition          
Schedule Of Debt Instruments [Line Items]          
Maximum limit of required debt-to-capital ratio     0.65    
Maximum limit of required debt-to-income ratio     3.75