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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Inventory [Line Items]    
U.S. inventories at average cost $ 431,866 $ 473,949
Foreign inventories at average cost 112,795 125,260
Inventory, Gross, Total 544,661 599,209
Less: Excess of average cost over LIFO cost for U.S. inventories 155,511 151,654
Inventories on consolidated balance sheets $ 389,150 $ 447,555