Retirement Benefits - Additional Information (Details1) (Other Postretirement Benefit Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit
Postretirement Plan Disclosure [Line Items]
Postretirement Plan, Service Cost	$ 182	$ 181	$ 364	$ 362
Postretirement Plan, Interest Cost	870	881	1,740	1,762
Postretirement Plan, Net amortization and deferral and other	116	129	233	258
Postretirement Plan, Net postretirement benefit cost	$ 1,168	$ 1,191	$ 2,337	$ 2,382