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Inventories (Tables)
 9 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following: 
(in thousands)
March 31, 2017
 
June 30, 2016
Finished goods
$
286,990

 
$
284,054

Work in process and powder blends
168,354

 
166,274

Raw materials
90,389

 
68,472

Inventories at current cost
545,733

 
518,800

Less: LIFO valuation
(55,521
)
 
(59,970
)
Total inventories
$
490,212

 
$
458,830