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Note 4 - Inventories (Tables)
9 Months Ended
Dec. 28, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 28,
2019
   
December 29,
2018
   
March 31,
2019
 
In Thousands                        
                         
Finished products
  $
465,306
    $
557,652
    $
454,920
 
In process
   
34,685
     
41,100
     
42,045
 
Raw materials and supplies
   
146,958
     
137,910
     
166,060
 
     
646,949
     
736,662
     
663,025
 
Less excess of FIFO cost over LIFO cost
   
153,884
     
160,727
     
161,341
 
Total inventories
  $
493,065
    $
575,935
    $
501,684