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Note 8 - Retirement Plans (Tables)
6 Months Ended
Sep. 29, 2018
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Three Months Ended
    Six Months Ended  
   
September 29,
2018
   
September 30,
2017
   
September 29,
2018
   
September 30,
2017
 
   
(In thousands)
 
Service Cost
  $
2,442
    $
1,981
    $
4,885
    $
3,963
 
Interest Cost
   
2,243
     
1,985
     
4,486
     
3,971
 
Expected Return on Plan Assets
   
(3,596
)    
(3,482
)    
(7,192
)    
(6,967
)
Amortization of Prior Service Cost
   
30
     
0
     
60
     
0
 
Amortization of Net Gain
   
303
     
30
     
605
     
60
 
Net Periodic Benefit Cost
  $
1,422
    $
514
    $
2,844
    $
1,027