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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Inventories    
Finished goods $ 279,240 $ 290,817
Work in process and powder blends 232,973 166,857
Raw materials 96,859 87,627
Inventories at current cost 609,072 545,301
Less: LIFO valuation (83,606) (57,620)
Total inventories $ 525,466 $ 487,681
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 40.00% 43.00%