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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Inventories    
Finished goods $ 290,530 $ 284,054
Work in process and powder blends 153,944 166,274
Raw materials 72,623 68,472
Inventories at current cost 517,097 518,800
Less: LIFO valuation (57,801) (59,970)
Total inventories $ 459,296 $ 458,830
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 45.00% 44.00%