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BUSINESS ACQUISITIONS AND DIVESTITURE - Oncotest, Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Nov. 18, 2015
Business Acquisition [Line Items]        
Goodwill $ 804,906 $ 787,517 $ 438,829  
Oncotest        
Business Acquisition [Line Items]        
Acquired receivables, contractual amount       $ 3,546
Trade receivables       3,520
Inventories       129
Other current assets (excluding cash)       706
Property, plant and equipment       2,528
Definite-lived intangible assets       13,330
Goodwill       22,894
Other long-term assets       250
Current liabilities       (3,456)
Long-term liabilities       (4,470)
Total purchase price allocation       $ 35,431