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BUSINESS ACQUISITIONS - WIL Research, Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Apr. 04, 2016
Dec. 26, 2015
Dec. 27, 2014
Business Acquisition [Line Items]        
Goodwill $ 787,517   $ 438,829 $ 321,077
WIL Research        
Business Acquisition [Line Items]        
Acquired receivables, contractual amount   $ 48,625    
Trade receivables   48,157    
Inventories   2,296    
Other current assets (excluding cash)   3,814    
Property, plant and equipment   129,066    
Other long-term assets   1,060    
Definite-lived intangible assets   164,800    
Goodwill   330,602    
Deferred revenue   (39,103)    
Current liabilities   (27,386)    
Long-term liabilities   (35,915)    
Total purchase price allocation   $ 577,391