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Investments (Tables)
 12 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
The following table shows gains and losses on trading securities: 
 
 
Year Ended June 30,
(In thousands)
 
2018
 
2017
 
2016
Total gains recognized from trading securities
 
$
7

 
$
286

 
$
611

Less: Realized gains from sales of trading securities
 
7

 
1,909

 
29

Unrealized (losses) gains from trading securities
 
$
—

 
$
(1,623
)
 
$
582