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Postretirement Benefits (Tables)
 6 Months Ended
Dec. 31, 2015
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 
 December 31,
 
Six Months Ended 
 December 31,
 
2015
 
2014
 
2015
 
2014
Components of net periodic benefit (income) cost
 
 
 
 
 
 
 
Service cost
$
6

 
$
8

 
$
13

 
$
16

Interest cost
17

 
27

 
47

 
54

Amortization of unrecognized net gain
(8
)
 
(7
)
 
(12
)
 
(14
)
Amortization of prior service credit
(31
)
 
(1
)
 
(32
)
 
(2
)
Net periodic benefit (income) cost
$
(16
)
 
$
27

 
$
16

 
$
54