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Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Net periodic costs
The following table provides summary disclosures of the net periodic postemployment costs recognized for the Company’s postemployment benefit plans:
 
 
Pension Benefits
 
Retiree Health Care
Benefits
Three Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Components of net periodic cost:
 
 
 
 
 
 
 
 
Service cost
 
$
24

 
$
19

 
$
13

 
$
12

Interest cost
 
224

 
295

 
24

 
35

Expected return on plan assets
 
(124
)
 
(104
)
 
—

 
—

Recognized net actuarial (gain) loss
 
140

 
153

 
(22
)
 
(9
)
Amortization of prior service cost
 
22

 
20

 
(68
)
 
(68
)
Net periodic cost
 
$
286

 
$
383

 
$
(53
)
 
$
(30
)