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Fair Values of Financial Instruments - Deferred Compensation Plan Commodity Hedging Agreements and Acquisition Related Contingent Consideration (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 31, 2017
Liabilities:            
Commodity hedging agreements $ 8,625   $ 10,305      
Fair Value Level 1 [Member]            
Assets:            
Deferred compensation plan assets 39,012   33,160      
Liabilities:            
Deferred compensation plan liabilities 39,012   33,160      
Fair Value Level 2 [Member]            
Liabilities:            
Nonpublic variable rate debt 370,000   372,500      
Nonpublic fixed rate debt 380,900   261,200      
Public debt securities 363,800   455,400      
Fair Value Level 2 [Member] | Commodity Contract [Member]            
Liabilities:            
Commodity hedging agreements 8,625   10,305      
Fair Value Level 3 [Member]            
Liabilities:            
Acquisition related contingent consideration 412,450 $ 393,007 382,898 $ 374,537 $ 368,804 $ 381,291
Carrying Amount [Member]            
Assets:            
Deferred compensation plan assets 39,012   33,160      
Liabilities:            
Deferred compensation plan liabilities 39,012   33,160      
Nonpublic variable rate debt 369,662   372,074      
Nonpublic fixed rate debt 374,696   274,717      
Public debt securities 347,794   457,612      
Acquisition related contingent consideration 412,450   382,898      
Carrying Amount [Member] | Commodity Contract [Member]            
Liabilities:            
Commodity hedging agreements 8,625   10,305      
Total Fair Value [Member]            
Assets:            
Deferred compensation plan assets 39,012   33,160      
Liabilities:            
Deferred compensation plan liabilities 39,012   33,160      
Acquisition related contingent consideration 412,450   382,898      
Nonpublic variable rate debt 370,000   372,500      
Nonpublic fixed rate debt 380,900   261,200      
Public debt securities 363,800   455,400      
Total Fair Value [Member] | Commodity Contract [Member]            
Liabilities:            
Commodity hedging agreements $ 8,625   $ 10,305