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Business Acquisitions - Early Discovery, Additional Information (Details) - Argenta and BioFocus [Member]
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2014
USD ($)
Mar. 28, 2015
USD ($)
Sep. 27, 2014
USD ($)
Sep. 27, 2014
USD ($)
Sep. 26, 2015
EUR (€)
Sep. 26, 2015
USD ($)
Business Acquisition [Line Items]            
Percentage of voting interests acquired 100.00%          
Acquisition purchase price $ 191,800          
Contingent consideration 900          
Gain on decrease in the expected future contingent consideration payment   $ 800        
Aggregate undiscounted amount of contingent consideration         € 5.0 $ 5,600
Total purchase price allocation 183,594          
Purchase price allocation, cash 8,200          
Acquisition related adjustments     $ 500 $ 5,400    
Revenue       46,800    
Operating loss       $ (400)    
Pro forma adjustments, acquisitions $ 3,700