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Note 5 - Inventories (Tables)
9 Months Ended
Dec. 26, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

December 26,

2020

   

December 28,

2019

   

March 31,

2020

 
                         
                         

Finished products

  $ 421,987     $ 465,306       351,251  

In process

    38,552       34,685       31,173  

Raw materials and supplies

    90,387       146,958       173,474  
      550,926       646,949       555,898  

Less excess of FIFO cost over LIFO cost

    139,999       153,884       144,267  

Total inventories

  $ 410,927     $ 493,065     $ 411,631