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Inventories
6 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
We used the last-in, first-out (LIFO) method of valuing inventories for 41 percent and 43 percent of total inventories at December 31, 2017 and June 30, 2017, respectively. Since inventory valuations under the LIFO method are based on an annual determination of quantities and costs as of June 30 of each year, the interim LIFO valuations are based on our projections of expected year-end inventory levels and costs. Therefore, the interim financial results are subject to any final year-end LIFO inventory adjustments.
Inventories consisted of the following: 
(in thousands)
December 31, 2017
 
June 30, 2017
Finished goods
$
283,812

 
$
290,817

Work in process and powder blends
210,265

 
166,857

Raw materials
86,944

 
87,627

Inventories at current cost
581,021

 
545,301

Less: LIFO valuation
(73,559
)
 
(57,620
)
Total inventories
$
507,462

 
$
487,681