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Postretirement Benefits
 9 Months Ended
Mar. 31, 2016
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Postretirement Benefits
Postretirement Benefits
We and certain of our operating subsidiaries provide multiple postretirement medical and life insurance benefit plans. We recognize the cost of benefits as the employees render service. Postretirement benefits are funded as incurred.
In the quarter ended December 31, 2015, we terminated the medical benefits offered under the plans. The reduction in these benefits was accounted for as a negative plan amendment and resulted in the subsequent remeasurement of our benefit obligation. The remeasurement reduced the net periodic benefit cost for 2016 compared to the amount expected prior to the remeasurement.
The following table summarizes the components of net periodic benefit (income) cost for our postretirement plans:
 
Three Months Ended 
 March 31,
 
Nine Months Ended 
 March 31,
 
2016
 
2015
 
2016
 
2015
Components of net periodic benefit (income) cost
 
 
 
 
 
 
 
Service cost
$
7

 
$
8

 
$
20

 
$
24

Interest cost
11

 
27

 
58

 
81

Amortization of unrecognized net gain
(11
)
 
(7
)
 
(23
)
 
(21
)
Amortization of prior service credit
(47
)
 
(1
)
 
(79
)
 
(3
)
Net periodic benefit (income) cost
$
(40
)
 
$
27

 
$
(24
)
 
$
81