Retirement Benefits - Additional Information (Details1) (Other Postretirement Benefit Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Other Postretirement Benefit Plans, Defined Benefit
Postretirement Plan Disclosure [Line Items]
Postretirement Plan, Service Cost	$ 182	$ 181
Postretirement Plan, Interest Cost	870	881
Postretirement Plan, Net amortization and deferral and other	117	129
Postretirement Plan, Net postretirement benefit cost	$ 1,169	$ 1,191