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Business Acquisitions - Chan Test Preliminary Purchase Price (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 29, 2014
Sep. 26, 2015
Sep. 27, 2014
Dec. 27, 2014
Business Acquisition [Line Items]        
Goodwill   $ 418,245   $ 321,077
Total purchase price allocation   $ 211,974 $ 183,151  
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