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Retirement Benefits (Tables)
6 Months Ended
Dec. 31, 2012
Pension Plans, Defined Benefit
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Defined Benefit Plans Disclosures
Net pension benefit cost recognized included the following components:
 
 
 
 
 
 
 
 
 
 
Three Months Ended December 31,
 
Six Months Ended December 31,
 
2012
 
2011
 
2012
 
2011
Service cost
$
26,683

 
$
21,000

 
$
55,017

 
$
42,624

Interest cost
44,920

 
46,823

 
87,993

 
92,739

Expected return on plan assets
(55,778
)
 
(50,101
)
 
(105,416
)
 
(100,270
)
Amortization of prior service cost
3,740

 
3,523

 
7,228

 
7,007

Amortization of net actuarial loss
52,565

 
27,046

 
100,148

 
52,460

Amortization of initial net obligation (asset)
6

 
(15
)
 
12

 
(30
)
Net pension benefit cost
$
72,136

 
$
48,276

 
$
144,982

 
$
94,530

Other Postretirement Benefit Plans, Defined Benefit
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Defined Benefit Plans Disclosures
Net postretirement benefit cost recognized included the following components:
 
 
 
 
 
 
 
 
 
 
Three Months Ended December 31,
 
Six Months Ended December 31,
 
2012
 
2011
 
2012
 
2011
Service cost
$
182

 
$
181

 
$
364

 
$
362

Interest cost
870

 
881

 
1,740

 
1,762

Net amortization and deferral and other
116

 
129

 
233

 
258

Net postretirement benefit cost
$
1,168

 
$
1,191

 
$
2,337

 
$
2,382