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Inventories (Tables)
 3 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
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