Retirement Benefits - Additional Information (Details1) (Other Postretirement Benefit Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit
Postretirement Plan Disclosure [Line Items]
Postretirement Plan, Service Cost	$ 255	$ 183	$ 619	$ 545
Postretirement Plan, Interest Cost	380	838	2,120	2,600
Postretirement Plan, Net amortization and deferral and other	726	92	959	350
Postretirement Plan, Net postretirement benefit cost	$ 1,361	$ 1,113	$ 3,698	$ 3,495