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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
Mar. 31, 2018
Dec. 30, 2017
Estimate of Fair Value Measurement    
Assets:    
Forward contracts $ 1,765 $ 2,438
Investment in publicly traded mutual funds 4,826 4,806
Interest rate swap 133 195
Total 6,724 7,439
Liabilities:    
Business combination, contingent consideration, liability 4,905 6,452
Forward contracts 20,056 17,885
Total 24,961 24,337
Level 1    
Assets:    
Forward contracts 0 0
Investment in publicly traded mutual funds 4,826 4,806
Interest rate swap 0 0
Total 4,826 4,806
Liabilities:    
Business combination, contingent consideration, liability 0 0
Forward contracts 0 0
Total 0 0
Level 2    
Assets:    
Forward contracts 1,765 2,438
Investment in publicly traded mutual funds 0 0
Interest rate swap 133 195
Total 1,898 2,633
Liabilities:    
Business combination, contingent consideration, liability 0 0
Forward contracts 20,056 17,885
Total 20,056 17,885
Level 3    
Assets:    
Forward contracts 0 0
Investment in publicly traded mutual funds 0 0
Interest rate swap 0 0
Total 0 0
Liabilities:    
Business combination, contingent consideration, liability 4,905 6,452
Forward contracts 0 0
Total $ 4,905 $ 6,452