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Business Acquisitions- WIL Research Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 24, 2016
Apr. 04, 2016
Dec. 26, 2015
Business Acquisition [Line Items]      
Goodwill $ 763,576   $ 438,829
WIL Research      
Business Acquisition [Line Items]      
Trade receivables, contractual amount   $ 48,625  
Trade receivables   48,157  
Inventories   2,296  
Other current assets (excluding cash)   4,021  
Property, plant and equipment   129,066  
Other long-term assets   1,060  
Definite-lived intangible assets   165,400  
Goodwill   330,229  
Deferred revenue   (39,103)  
Other current liabilities   (27,386)  
Long-term liabilities   (36,349)  
Total purchase price allocation   $ 577,391