Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 45,920	$ 38,956	$ 75,306	$ 72,356
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	134	168	268	338
Amortization of prior service credit, before tax	(46)	(45)	(91)	(90)
Total Other Comprehensive Income, Before Tax	88	123	177	248
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(50)	(62)	(99)	(125)
Amortization of prior service credit, tax	17	17	33	33
Total Tax Expense	(33)	(45)	(66)	(92)
Other Comprehensive Income, Net of Tax	55	78	111	156
Comprehensive Income	$ 45,975	$ 39,034	$ 75,417	$ 72,512