Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 111,286	$ 89,586	$ 142,332
Defined Benefit Pension and Postretirement Benefit Plans:
Net gain (loss) arising during the period, before tax	1,859	(4,029)	4,490
Amortization of loss, before tax	679	401	672
Amortization of prior service credit, before tax	(181)	(181)	(181)
Total Other Comprehensive Income (Loss), Before Tax	2,357	(3,809)	4,981
Tax Attributes of Items in Other Comprehensive Income (Loss):
Net gain (loss) arising during the period, tax	(434)	942	(1,049)
Amortization of loss, tax	(158)	(94)	(157)
Amortization of prior service credit, tax	42	42	42
Total Tax (Expense) Benefit	(550)	890	(1,164)
Other Comprehensive Income (Loss), Net of Tax	1,807	(2,919)	3,817
Comprehensive Income	$ 113,093	$ 86,667	$ 146,149