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Segment Information - Revenue Per Significant Product or Service (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 26, 2016
Mar. 28, 2015
Segment Reporting Information [Line Items]    
Revenue $ 354,868 $ 320,414
Operating segments | RMS    
Segment Reporting Information [Line Items]    
Revenue 124,010 120,011
Operating segments | DSA    
Segment Reporting Information [Line Items]    
Revenue 157,983 140,012
Operating segments | Manufacturing    
Segment Reporting Information [Line Items]    
Revenue $ 72,875 $ 60,391