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Note 7 - Retirement Plans (Tables)
9 Months Ended
Dec. 30, 2017
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Three Months Ended
   
Nine Months Ended
 
   
December 30,
2017
   
December 31,
2016
   
December 30,
2017
   
December 31,
2016
 
   
(In thousands)
 
Service Cost
  $
1,981
    $
2,164
    $
5,944
    $
6,491
 
Interest Cost
   
1,985
     
1,919
     
5,956
     
5,756
 
Expected Return on Plan Assets
   
(3,673
)    
(2,978
)    
(10,640
)    
(8,934
)
Amortization of Actuarial Loss
   
-
     
679
     
-
     
2,037
 
Amortization of Transition Asset
   
30
     
27
     
90
     
82
 
Net Periodic Benefit Cost
  $
323
    $
1,811
    $
1,350
    $
5,432