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Business Acquisitions- WIL Research Additional Information (Details) - WIL Research - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 04, 2016
Sep. 24, 2016
Sep. 24, 2016
Sep. 26, 2015
Business Acquisition [Line Items]        
Purchase price $ 604,800      
Assumed liabilities 400      
Total purchase price allocation 577,391      
Cash acquired 27,400      
Goodwill, expected tax deductible amount $ 19,000      
Integration related costs and transaction costs   $ 1,300 $ 13,700  
Revenue   57,400 112,600  
Operating income (loss)   $ 3,600 4,600  
Amortization of intangible assets and depreciation of fixed assets     1,400 $ 5,800
Reversal of interest expense on borrowings     $ 2,700 8,200
Transaction costs       $ 9,800