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FAIR VALUE - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 18,717 $ 21
Other current assets:    
Foreign currency forward contract 29  
Other assets:    
Life insurance policies 28,193 26,358
Total assets measured at fair value 46,939 26,379
Other current liabilities:    
Contingent consideration 3,400 298
Total liabilities measured at fair value 3,400 298
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 0 0
Other current liabilities:    
Contingent consideration 0 0
Total liabilities measured at fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 18,717 21
Other current assets:    
Foreign currency forward contract 29  
Other assets:    
Life insurance policies 28,193 26,358
Total assets measured at fair value 46,939 26,379
Other current liabilities:    
Contingent consideration 0 0
Total liabilities measured at fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 0 0
Other current liabilities:    
Contingent consideration 3,400 298
Total liabilities measured at fair value $ 3,400 $ 298