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Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Oct. 01, 2018
Mar. 30, 2019
Mar. 31, 2018
Dec. 29, 2018
Share Price $ 25.10      
Amortization of Intangible Assets, Total   $ 10,019 $ 1,074  
Secured Term Loan Facility [Member]        
Debt Instrument, Face Amount $ 350,000      
Debt Instrument, Amortization, Percentage of Principal Amount 0.25%      
Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 3.00%      
Xcerra [Member]        
Business Combination, Consideration Transferred, Total $ 794,400      
Payments to Acquire Businesses, Gross 160,500      
Business Combination, Acquisition Related Costs   200 $ 300  
Xcerra [Member] | In-process Technology [Member]        
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance   $ 36,300   $ 36,300
Xcerra [Member] | Fair Value Adjustment to Inventory [Member]        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value $ 19,600      
Xcerra [Member] | Common Stock [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 11,776,149      
Xcerra [Member] | Cohu RSUs [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 529,995      
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Attributed to Pre-Merger Services $ 800