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Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 28,897	$ 22,429	$ 110,606	$ 106,598
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	167	136	503	409
Amortization of prior service credit, before tax	(45)	(45)	(136)	(136)
Total Other Comprehensive Income, Before Tax	122	91	367	273
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(39)	(31)	(117)	(95)
Amortization of prior service credit, tax	11	10	32	31
Total Tax Expense	(28)	(21)	(85)	(64)
Other Comprehensive Income, Net of Tax	94	70	282	209
Comprehensive Income	$ 28,991	$ 22,499	$ 110,888	$ 106,807

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