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Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Net periodic costs
The following table provides summary disclosures of the net periodic post-employment costs recognized for the Company’s post-employment benefit plans:
 
 
Pension Benefits
 
Retiree Health Care
Benefits
Three Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Components of net periodic cost:
 
 
 
 
 
 
 
 
Service cost
 
$
31

 
$
23

 
$
7

 
$
6

Interest cost
 
173

 
216

 
16

 
19

Expected return on plan assets
 
(115
)
 
(123
)
 
—

 
—

Recognized net actuarial (gain) loss
 
218

 
228

 
(45
)
 
(53
)
Amortization of prior service cost
 
22

 
22

 
(68
)
 
(68
)
Net periodic cost
 
$
329

 
$
366

 
$
(90
)
 
$
(96
)