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Note 5 - Derivative Financial Instruments (Tables)
 6 Months Ended
Oct. 27, 2018
Notes Tables  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
   
(In thousands)
  
   
Three Months Ended
    
Six Months Ended
  
   
2018
    
2017
    
2018
    
2017
  
Recognized in AOCI:
                                
Gain before income taxes
   $
1,076
     $
5,523
     $
7,424
     $
4,556
  
Less income tax provision
    
257
      
2,049
      
1,776
      
1,690
  
Net
   $
819
     $
3,474
     $
5,648
     $
2,866
  
Reclassified from AOCI to cost of sales:
                                
Gain before income taxes
   $
4,596
     $
362
     $
13,530
     $
393
  
Less income tax provision
    
1,061
      
135
      
3,125
      
146
  
Net
   $
3,535
     $
227
     $
10,405
     $
247
  
Net change to AOCI
   $
(2,716
 )   $
3,247
     $
(4,757
 )   $
2,619