Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 30,604	$ 27,621	$ 117,539	$ 102,927
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	102	134	307	402
Amortization of prior service credit, before tax	(46)	(45)	(137)	(136)
Total Other Comprehensive Income, Before Tax	56	89	170	266
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(24)	(41)	(72)	(140)
Amortization of prior service credit, tax	11	14	32	47
Total Tax Expense	(13)	(27)	(40)	(93)
Other Comprehensive Income, Net of Tax	43	62	130	173
Comprehensive Income	$ 30,647	$ 27,683	$ 117,669	$ 103,100