Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net Income	$ 26,662	$ 21,258
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	167	81
Amortization of prior service asset, before tax	(1)	(1)
Total Other Comprehensive Income, Before Tax	166	80
Amortization of loss, tax	(62)	(30)
Amortization of prior service asset, tax	0	0
Total Other Comprehensive Income, Tax	(62)	(30)
Other Comprehensive Income, Net of Tax	104	50
Comprehensive Income	$ 26,766	$ 21,308