Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net Income	$ 35,277	$ 30,373	$ 61,939	$ 51,631
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	167	81	334	162
Amortization of prior service asset, before tax	(1)	(1)	(2)	(2)
Total Other Comprehensive Income, Before Tax	166	80	332	160
Amortization of loss, tax	(62)	(31)	(124)	(61)
Amortization of prior service asset, tax	0	0	0	0
Total Other Comprehensive Income, Tax	(62)	(31)	(124)	(61)
Other Comprehensive Income, Net of Tax	104	49	208	99
Comprehensive Income	$ 35,381	$ 30,422	$ 62,147	$ 51,730