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Postretirement Benefits (Tables)
 9 Months Ended
Mar. 31, 2016
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Periodic Benefit (Income) Cost
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