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Short-term and Long-term Debt - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 22, 2018
USD ($)
Jun. 30, 2018
USD ($)
revision
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
revision
Jul. 01, 2017
USD ($)
Dec. 30, 2017
USD ($)
Feb. 20, 2018
USD ($)
Schedule Of Debt Instruments [Line Items]              
Notes payable and current maturities of long-term debt   $ 127,600,000   $ 127,600,000   $ 433,200,000  
Commercial paper outstanding   115,500,000   115,500,000   151,000,000  
Other notes payable   12,100,000   12,100,000   32,200,000  
Loss on early extinguishment of debt   0 $ 0 7,800,000 $ 0    
Proceeds from sale of unsecured long-term notes       $ 395,400,000 $ 297,800,000    
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   $ 700,000,000      
Revolving credit facility, termination date       Dec. 15, 2020      
Revolving credit facility, outstanding amount   $ 0   $ 0      
Number of allowed revisions to debt ratios | revision   2   2      
Actual debt-to-capital ratio   0.23   0.23      
Actual debt-to-income ratio   1.00   1.00      
Five-year Multi-Currency Revolving Credit Facility | Maximum              
Schedule Of Debt Instruments [Line Items]              
Maximum limit of required debt-to-capital ratio   0.6   0.6      
Maximum limit of required debt-to-income ratio   3.5   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   0.65      
Maximum limit of required debt-to-income ratio   3.75   3.75      
4.25% unsecured notes due 2018              
Schedule Of Debt Instruments [Line Items]              
Debt instrument, face amount           $ 250,000,000  
Unsecured notes, interest rate           4.25%  
Unsecured notes, maturity period           Jan. 16, 2018  
6.70% unsecured notes due 2019              
Schedule Of Debt Instruments [Line Items]              
Unsecured notes, interest rate           6.70%  
Unsecured notes   $ 0   $ 0   $ 200,000,000  
2019 Notes              
Schedule Of Debt Instruments [Line Items]              
Debt instrument, repurchase amount             $ 26,100,000
Payment for debt extinguishment $ 209,100,000            
Accrued interest 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%     4.10%
Unsecured notes   $ 400,000,000   $ 400,000,000   $ 0  
Proceeds from sale of unsecured long-term notes       395,400,000      
Transaction costs   $ 3,500,000   $ 3,500,000