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Note 6 - Derivative Financial Instruments (Tables)
 12 Months Ended
Apr. 28, 2018
Notes Tables  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
   
(In thousands)
  
   
Fiscal
    
Fiscal
    
Fiscal
  
   
2018
    
2017
    
2016
  
Recognized in AOCI-
                        
Gain (loss) before income taxes
   $
9,498
     $
(984
 )   $
(5,743
 )
Less income tax provision (benefit)
    
3,085
      
(365
 )    
( 2,131
 )
Net
    
6,413
      
(619
 )    
(3,612
 )
Reclassified from AOCI to cost of sales-
                        
Gain (loss) before income taxes
    
2,569
      
(2,749
 )    
(6,987
 )
Less income tax provision (benefit)
    
1,383
      
(1,020
 )    
(2,592
 )
Net
    
1,186
      
(1,729
 )    
(4,395
 )
                         
Net change to AOCI
   $
5,227
     $
1,110
     $
783