Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 22,429	$ 30,604	$ 106,598	$ 117,539
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	136	102	409	307
Amortization of prior service credit, before tax	(45)	(46)	(136)	(137)
Total Other Comprehensive Income, Before Tax	91	56	273	170
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(31)	(24)	(95)	(72)
Amortization of prior service credit, tax	10	11	31	32
Total Tax Expense	(21)	(13)	(64)	(40)
Other Comprehensive Income, Net of Tax	70	43	209	130
Comprehensive Income	$ 22,499	$ 30,647	$ 106,807	$ 117,669