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Note 8 - Retirement Plans (Tables)
 9 Months Ended
Dec. 28, 2019
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
December 28,
2019
    
December 29,
2018
    
December 28,
2019
    
December 29,
2018
  
   
(In thousands)
  
Service Cost
   $
2,283
     $
1,831
     $
6,848
     $
6,716
  
Interest Cost
    
2,316
      
2,362
      
6,947
      
6,848
  
Expected Return on Plan Assets
    
(3,957
 )    
(3,593
 )    
(11,870
 )    
(10,785
 )
Amortization of Prior Service Cost
    
30
      
30
      
90
      
90
  
Amortization of Net Loss
    
29
      
593
      
87
      
1,198
  
Net Periodic Benefit Cost
   $
701
     $
1,223
     $
2,102
     $
4,067