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Note 2 - Business Acquisitions (Details Textual)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 01, 2018
USD ($)
$ / shares
shares
Dec. 28, 2019
USD ($)
Dec. 29, 2018
USD ($)
Share Price | $ / shares $ 25.10    
Secured Term Loan Facility [Member]      
Debt Instrument, Face Amount $ 350.0    
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 $ 794.4    
Business Combination, Number of Brands Acquired 4    
Payments to Acquire Businesses, Gross $ 160.5    
Business Combination, Acquisition Related Costs   $ 0.4 $ 9.8
Xcerra [Member] | Fair Value Adjustment to Inventory [Member]      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value $ 19.6    
Xcerra [Member] | Severance and Other Separation Payments [Member]      
Business Combination, Contingent Consideration, Liability, Total     $ 6.9
Xcerra [Member] | Common Stock [Member]      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 11,776,149    
Xcerra [Member] | Cohu RSUs [Member]      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 529,995    
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Attributed to Pre-Merger Services $ 0.8