Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 43,424	$ 47,907	$ 84,169	$ 86,935
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	137	102	273	205
Amortization of prior service credit, before tax	(46)	(45)	(91)	(91)
Total Other Comprehensive Income, Before Tax	91	57	182	114
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(33)	(24)	(64)	(48)
Amortization of prior service credit, tax	11	10	21	21
Total Tax Expense	(22)	(14)	(43)	(27)
Other Comprehensive Income, Net of Tax	69	43	139	87
Comprehensive Income	$ 43,493	$ 47,950	$ 84,308	$ 87,022