Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

v3.8.0.1
Fair Value of Financial Instruments (Details) - Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Liabilities    
Liabilities measured at fair value $ 34,789 $ 33,882
Forward Foreign Exchange Contract [Member]    
Liabilities    
Liabilities measured at fair value 505  
Level 2 [Member]    
Liabilities    
Liabilities measured at fair value 505  
Level 2 [Member] | Forward Foreign Exchange Contract [Member]    
Liabilities    
Liabilities measured at fair value 505  
Level 3 [Member]    
Liabilities    
Liabilities measured at fair value 34,284 33,882
Contingent Consideration [Member]    
Liabilities    
Liabilities measured at fair value 34,284 33,882
Contingent Consideration [Member] | Level 3 [Member]    
Liabilities    
Liabilities measured at fair value $ 34,284 $ 33,882