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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
Dec. 30, 2017
Dec. 31, 2016
Total    
Assets:    
Forward contracts $ 2,438 $ 28,936
Investment in publicly traded mutual funds 4,806 2,385
Interest rate swap 195 73
Total 7,439 31,394
Liabilities:    
Contingent consideration 6,452  
Forward contracts 17,885 4,966
Interest rate swap   613
Total 24,337 5,579
Level 1    
Assets:    
Forward contracts 0 0
Investment in publicly traded mutual funds 4,806 2,385
Interest rate swap 0 0
Total 4,806 2,385
Liabilities:    
Contingent consideration 0  
Forward contracts 0 0
Interest rate swap   0
Total 0 0
Level 2    
Assets:    
Forward contracts 2,438 28,936
Investment in publicly traded mutual funds 0 0
Interest rate swap 195 73
Total 2,633 29,009
Liabilities:    
Contingent consideration 0  
Forward contracts 17,885 4,966
Interest rate swap   613
Total 17,885 5,579
Level 3    
Assets:    
Forward contracts 0 0
Investment in publicly traded mutual funds 0 0
Interest rate swap 0 0
Total 0 0
Liabilities:    
Contingent consideration 6,452  
Forward contracts 0 0
Interest rate swap   0
Total $ 6,452 $ 0