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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Inventories    
Finished goods $ 309,182 $ 279,240
Work in process and powder blends 261,074 232,973
Raw materials 101,887 96,859
Inventories at current cost 672,143 609,072
Less: LIFO valuation (83,530) (83,606)
Total inventories $ 588,613 $ 525,466
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 41.00% 40.00%