Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 29,386	$ 33,400
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	134	170
Amortization of prior service credit, before tax	(45)	(45)
Total Other Comprehensive Income, Before Tax	89	125
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(49)	(63)
Amortization of prior service credit, tax	16	16
Total Tax Expense	(33)	(47)
Other Comprehensive Income, Net of Tax	56	78
Comprehensive Income	$ 29,442	$ 33,478