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Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2018
Retirement Benefits [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,
 
2018
 
2017
 
2018
 
2017
Components of net periodic cost:
 
 
 
 
 
 
 
 
Service cost
 
$
11

 
$
31

 
$
4

 
$
5

Interest cost
 
174

 
183

 
13

 
13

Expected return on plan assets
 
(133
)
 
(118
)
 
—

 
—

Recognized net actuarial loss (gain)
 
46

 
106

 
(30
)
 
(39
)
Amortization of prior service cost
 
—

 
7

 
(92
)
 
(92
)
Net periodic cost (benefit)
 
$
98

 
$
209

 
$
(105
)
 
$
(113
)