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Inventories (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Inventory [Line Items]    
Inventory Write-down $ 6,000  
Effect of LIFO Inventory Liquidation on Income 9,414 $ 2,100
Items Of Inventories    
U.S. inventories at average cost 373,984 380,000
Foreign inventories at average cost 108,734 105,465
Inventory, Gross, Total 482,718 485,465
Less: Excess of average cost over LIFO cost for U.S. inventories 137,573 147,244
Inventories on consolidated balance sheets $ 345,145 $ 338,221