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Note 2 - Business Acquisitions - Purchase Price Allocation, Xcerra Acquisition (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Oct. 01, 2018
Dec. 30, 2017
Dec. 31, 2016
Goodwill $ 242,127   $ 65,613 $ 58,849
Xcerra [Member]        
Current assets, including cash received   $ 375,990    
Property, plant and equipment   40,729    
Other assets   2,109    
Intangible assets   321,160    
Goodwill   179,263    
Total assets acquired   919,251    
Liabilities assumed   (124,821)    
Net assets acquired   $ 794,430