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Note 5 - Derivative Financial Instruments (Tables)
 3 Months Ended
Jul. 28, 2018
Notes Tables  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
   
(In thousands)
  
   
2018
    
2017
  
Recognized in AOCI:
                
Gain (loss) before income taxes
   $
6,347
     $
(967
 )
Less income tax provision (benefit)
    
1,518
      
(359
 )
Net
    
4,829
      
(608
 )
Reclassified from AOCI to cost of sales:
                
Gain before income taxes
    
8,934
      
31
  
Less income tax provision
    
2,064
      
11
  
Net
    
6,870
      
20
  
Net change to AOCI
   $
(2,041
 )   $
(628
 )