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Inventories (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Inventory Disclosure [Abstract]      
Inventories $ 52,536   $ 52,987
Inventory, LIFO Reserve 24,373   24,541
Inventory difference using FIFO basis 27,900   33,100
LIFO inventory amount 3,500   $ 8,600
Effect of LIFO Reserve on income $ (500) $ 300