Pensions And Other Postretirement Benefits (Details) (USD $) In Thousands	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Pension benefit cost [Member]
Pension benefit cost
Service cost	$ 1,381	$ 2,197
Interest cost	2,123	1,967
Expected return on plan assets	(2,166)	(1,812)
Amortization of prior service cost	65	53
Recognized actuarial losses	290	893
Amortization of transition obligation	10	9
Benefit cost	1,703	3,307
Retiree health care benefit cost [Member]
Pension benefit cost
Service cost	274	342
Interest cost	586	617
Amortization of prior service cost	(516)	(516)
Recognized actuarial losses	82	333
Benefit cost	$ 426	$ 776