Pension and Postretirement Benefit Plans (Details) (USD $) In Thousands	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 2,359	$ 2,412
Interest Cost	1,497	1,324
Expected return on plan assets	(2,504)	(2,172)
Prior service cost amortization	92	93
Actuarial loss amortization	401	1,167
Net periodic benefit costs	1,845	2,824
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	113	119
Interest Cost	240	198
Prior service cost amortization	(134)	(184)
Actuarial loss amortization	15	0
Net periodic benefit costs	$ 234	$ 133