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Inventories (Details) - USD ($)
$ in Thousands
Dec. 29, 2019
Mar. 31, 2019
Summary of Inventories    
Inventory (FIFO basis) $ 61,976 $ 65,526
LIFO reserve (4,434) (5,044)
Net inventory 57,542 60,482
LIFO Inventory Amount $ 43,700 $ 45,200