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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 30, 2015
Inventories    
Finished goods $ 295,609 $ 324,840
Work in process and powder blends 173,360 249,629
Raw materials 70,628 100,881
Inventories at current cost 539,597 675,350
Less: LIFO valuation (62,098) (99,819)
Total inventories $ 477,499 $ 575,531
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 47.00% 47.00%