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Inventories (Tables)
 6 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
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