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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Inventories    
Finished goods $ 283,812 $ 290,817
Work in process and powder blends 210,265 166,857
Raw materials 86,944 87,627
Inventories at current cost 581,021 545,301
Less: LIFO valuation (73,559) (57,620)
Total inventories $ 507,462 $ 487,681
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 41.00% 43.00%