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Note 5 - Derivative Financial Instruments (Tables)
 9 Months Ended
Jan. 26, 2019
Notes Tables  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
   
(In thousands)
  
   
Three Months Ended
    
Nine Months Ended
  
   
2019
    
2018
    
2019
    
2018
  
Recognized in AOCI:
                                
(Loss) gain before income taxes
   $
(1,937
 )   $
2,067
     $
5,487
     $
6,623
  
Less income tax (benefit) provision
    
(463
 )    
731
      
1,313
      
2,421
  
Net
   $
(1,474
 )   $
1,336
     $
4,174
     $
4,202
  
Reclassified from AOCI to cost of sales:
                                
(Loss) gain before income taxes
   $
(305
 )   $
844
     $
13,225
     $
1,237
  
Less income tax (benefit) provision
    
(73
 )    
289
      
3,053
      
435
  
Net
   $
(232
 )   $
555
     $
10,172
     $
802
  
Reclassified tax effects to provision for income taxes 
   $
0
     $
515
     $
0
     $
515
  
Net change to AOCI
   $
(1,242
 )   $
1,296
     $
(5,998
 )   $
3,915