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Inventories
3 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
We used the last-in, first-out (LIFO) method of valuing inventories for 39 percent and 40 percent of total inventories at September 30, 2018 and June 30, 2018, 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)
September 30, 2018
 
June 30, 2018
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