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BUSINESS ACQUISITIONS AND DIVESTITURE - WIL Research, Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Apr. 04, 2016
Dec. 26, 2015
Business Acquisition [Line Items]        
Goodwill $ 804,906 $ 787,517   $ 438,829
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     330,175  
Deferred revenue     (39,103)  
Current liabilities     (27,386)  
Long-term liabilities     (35,488)  
Total purchase price allocation     $ 577,391