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Fair Values of Financial Instruments - Deferred Compensation Plan Commodity Hedging Agreements and Acquisition Related Contingent Consideration (Detail) - USD ($)
$ in Thousands
Apr. 01, 2018
Dec. 31, 2017
Apr. 02, 2017
Jan. 01, 2017
Assets:        
Commodity hedging agreements $ 1,453 $ 4,420    
Fair Value Level 1 [Member]        
Assets:        
Deferred compensation plan assets 32,993 33,166    
Liabilities:        
Deferred compensation plan liabilities 32,993 33,166    
Fair Value Level 2 [Member]        
Liabilities:        
Non-public variable rate debt 480,000 507,000    
Non-public fixed rate debt 264,800 126,400    
Public debt securities 466,200 475,100    
Fair Value Level 2 [Member] | Commodity Contract [Member]        
Assets:        
Commodity hedging agreements 1,453 4,420    
Fair Value Level 3 [Member]        
Liabilities:        
Acquisition related contingent consideration 368,804 381,291 $ 303,952 $ 253,437
Carrying Amount [Member]        
Assets:        
Deferred compensation plan assets 32,993 33,166    
Liabilities:        
Deferred compensation plan liabilities 32,993 33,166    
Non-public variable rate debt 479,442 506,398    
Non-public fixed rate debt 274,660 124,829    
Public debt securities 457,007 456,791    
Acquisition related contingent consideration 368,804 381,291    
Carrying Amount [Member] | Commodity Contract [Member]        
Assets:        
Commodity hedging agreements 1,453 4,420    
Total Fair Value [Member]        
Assets:        
Deferred compensation plan assets 32,993 33,166    
Liabilities:        
Deferred compensation plan liabilities 32,993 33,166    
Acquisition related contingent consideration 368,804 381,291    
Non-public variable rate debt 480,000 507,000    
Non-public fixed rate debt 264,800 126,400    
Public debt securities 466,200 475,100    
Total Fair Value [Member] | Commodity Contract [Member]        
Assets:        
Commodity hedging agreements $ 1,453 $ 4,420