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Postretirement Benefits (Tables) (Postretirement Benefits [Member])
 6 Months Ended
Dec. 31, 2014
Postretirement Benefits [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Periodic Benefit Cost
The following table summarizes the components of net periodic benefit cost for our postretirement plans:
 
Three Months Ended 
 December 31,
 
Six Months Ended 
 December 31,
 
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
8

 
$
8

 
$
16

 
$
16

Interest cost
27

 
32

 
54

 
64

Amortization of unrecognized net gain
(7
)
 
(7
)
 
(14
)
 
(14
)
Amortization of prior service asset
(1
)
 
(1
)
 
(2
)
 
(2
)
Net periodic benefit cost
$
27

 
$
32

 
$
54

 
$
64