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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018
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Inventories |  |
Finished goods | $ 299,121 | $ 279,240
Work in process and powder blends | 251,322 | 232,973
Raw materials | 102,339 | 96,859
Inventories at current cost | 652,782 | 609,072
Less: LIFO valuation | (83,530) | (83,606)
Total inventories | $ 569,252 | $ 525,466
Inventories (Textual) [Abstract] |  |
Percentage of inventories valued by using LIFO method | 39.00% | 40.00%

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