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SUMMARY OF ACCOUNTING POLICIES - Revenue Recognition Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 28, 2018
Jun. 29, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Reduced gross profit                 $ 132,700    
New revenue standard adoption impact                 9,300    
Net sales $ 6,226,124 $ 6,922,827 $ 6,662,604 $ 6,398,956 $ 6,410,887 $ 6,751,552 $ 6,270,420 $ 6,008,272 26,210,511 $ 25,441,131 $ 23,862,934
Gross profit $ 380,295 357,325 402,301 377,854 $ 349,297 $ 446,328 $ 393,325 $ 406,932 1,517,775 $ 1,595,882 $ 1,520,945
Additional revenue due to ASC 606                 158,400    
Additional gross profit recognized due to ASC 606                 6,500    
Accounting Standards Update 2014-09                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net sales   $ 22,000 $ 48,000 $ 25,000              
Accounting Standards Update 2014-09 | Adjustment                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net sales                 (25,665)    
Gross profit                 $ 2,741