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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Inventories    
Finished goods $ 312,524 $ 311,684
Work in process and powder blends 194,933 246,414
Raw materials 78,892 95,620
Inventories at current cost 586,349 653,718
Less: LIFO valuation (63,850) (82,142)
Total inventories $ 522,499 $ 571,576
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 40.00% 41.00%