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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Inventories    
Finished goods $ 293,990 $ 311,684
Work in process and powder blends 197,991 246,414
Raw materials 89,435 95,620
Inventories at current cost 581,416 653,718
Less: LIFO valuation (64,635) (82,142)
Total inventories $ 516,781 $ 571,576
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 43.00% 41.00%