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Benefit Plans (Tables)
 9 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Net periodic costs
The following table provides summary disclosures of the net periodic postemployment costs recognized for the Company’s postemployment benefit plans:

 
 
Pension Benefits
 
Retiree Health Care
Benefits
Three Months Ended March 31,
 
2013
 
2012
 
2013
 
2012
Components of net periodic cost:
 
 
 
 
 
 
 
 
Service cost
 
$
20

 
$
17

 
$
20

 
$
7

Interest cost
 
314

 
436

 
47

 
59

Expected return on plan assets
 
(101
)
 
(99
)
 

 

Recognized net actuarial loss (gain)
 
184

 
57

 
(13
)
 
(18
)
Amortization of prior service cost
 
21

 
21

 
27

 
35

Net periodic cost
 
$
438

 
$
432

 
$
81

 
$
83


 
 
Pension Benefits
 
Retiree Health Care
Benefits
Nine Months Ended March 31,
 
2013
 
2012
 
2013
 
2012
Components of net periodic cost:
 
 
 
 
 
 
 
 
Service cost
 
$
60

 
$
271

 
$
60

 
$
22

Interest cost
 
945

 
1,612

 
142

 
177

Expected return on plan assets
 
(303
)
 
(297
)
 

 

Recognized net actuarial loss (gain)
 
551

 
586

 
(40
)
 
(54
)
Amortization of prior service cost
 
62

 
391

 
80

 
105

Curtailment loss
 


 
3,117

 


 


Net periodic cost
 
$
1,315

 
$
5,680

 
$
242

 
$
250