Pension and Other Postretirement Benefits - Funded Status of Other Postretirement Benefit Plans and Amounts Recognized in the Consolidated Balance Sheets (Details) - Other Postretirement Benefit Plan, Defined Benefit [Member] - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Change in Benefit Obligation
Benefit Obligation, Beginning of Year	$ 9,113	$ 11,383
Interest Cost	417	288	$ 307
Actuarial Losses	(442)	(1,402)
Benefits and expenses paid	(1,067)	(1,224)
Plan Amendments	(130)	68
Benefit Obligation, End of Year	7,891	9,113	$ 11,383
Funded Status of Plans	(7,891)	(9,113)
Amounts Recognized in Balance Sheet
Short-term Accrued Benefit Obligation	(1,091)	(1,189)
Accrued Postretirement Benefits	(6,800)	(7,924)
Net Amount Recognized	$ (7,891)	$ (9,113)