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Inventories (Tables)
 12 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following at June 30: 
(in thousands)
2017
 
2016
Finished goods
$
290,817

 
$
284,054

Work in process and powder blends
166,857

 
166,274

Raw materials
87,627

 
68,472

Inventories at current cost
545,301

 
518,800

Less: LIFO valuation
(57,620
)
 
(59,970
)
Total inventories
$
487,681

 
$
458,830