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Note 5 - Derivative Financial Instruments (Tables)
 9 Months Ended
Jan. 27, 2018
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
  
   
201
8
    
201
7
    
201
8
    
201
7
  
Recognized in AOCI:
                                
Gain (loss) before income taxes
   $
2,067
     $
176
     $
6,623
     $
(21
 )
Less income tax
provision (benefit)
    
731
      
65
      
2,421
      
(8
 )
Net
   $
1,336
     $
111
     $
4,202
     $
(13
 )
Reclassified from AOCI to cost of sales:
                                
Gain (loss) before income taxes
   $
844
     $
(651
 )   $
1,237
     $
(2,844
 )
Less income tax provision (benefit)
    
289
      
(242
 )    
435
      
(1,056
 )
Net
   $
555
     $
(409
 )   $
802
     $
(1,788
 )
Reclassified
tax effects to provision for income taxes (see Note 6)
   $
515
     $
-
     $
515
     $
-
  
Net change to AOCI
   $
1,296
     $
520
     $
3,915
     $
1,775