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FAIR VALUE MEASUREMENTS (Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value Measurement, Recurring Basis - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Estimate of Fair Value Measurement    
Assets:    
Forward contracts $ 6,115 $ 2,438
Investment in publicly traded mutual funds 4,870 4,806
Interest rate swap   195
Total 10,985 7,439
Liabilities:    
Contingent consideration 3,954 6,452
Forward contracts 4,075 17,885
Total 8,029 24,337
Level 1    
Assets:    
Forward contracts 0 0
Investment in publicly traded mutual funds 4,870 4,806
Interest rate swap   0
Total 4,870 4,806
Liabilities:    
Contingent consideration 0 0
Forward contracts 0 0
Total 0 0
Level 2    
Assets:    
Forward contracts 6,115 2,438
Investment in publicly traded mutual funds 0 0
Interest rate swap   195
Total 6,115 2,633
Liabilities:    
Contingent consideration 0 0
Forward contracts 4,075 17,885
Total 4,075 17,885
Level 3    
Assets:    
Forward contracts 0 0
Investment in publicly traded mutual funds 0 0
Interest rate swap   0
Total 0 0
Liabilities:    
Contingent consideration 3,954 6,452
Forward contracts 0 0
Total $ 3,954 $ 6,452