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Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
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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Inventories.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a)(1))
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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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