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Business Acquisitions ChanTest Preliminary Purchase Price (Details) - USD ($)
$ in Thousands
Dec. 26, 2015
Dec. 27, 2014
Oct. 29, 2014
Dec. 28, 2013
Business Acquisition [Line Items]        
Goodwill $ 438,829 $ 321,077   $ 230,701
ChanTest        
Business Acquisition [Line Items]        
Current assets (excluding cash)     $ 4,669  
Property, plant and equipment     1,637  
Definite-lived intangible assets     23,920  
Goodwill     34,775  
Current liabilities     (3,486)  
Long-term liabilities     (9,486)  
Total purchase price allocation     $ 52,029