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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Inventories    
Finished goods $ 290,817 $ 284,054
Work in process and powder blends 166,857 166,274
Raw materials 87,627 68,472
Inventories at current cost 545,301 518,800
Less: LIFO valuation (57,620) (59,970)
Total inventories $ 487,681 $ 458,830
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 43.00% 44.00%