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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Inventories    
Finished goods $ 304,313 $ 290,817
Work in process and powder blends 217,659 166,857
Raw materials 88,792 87,627
Inventories at current cost 610,764 545,301
Less: LIFO valuation (73,559) (57,620)
Total inventories $ 537,205 $ 487,681
Inventories (Textual) [Abstract]    
Percentage of inventories valued by using LIFO method 39.00% 43.00%