Pension and Other Postretirement Benefits - Components of Net Periodic Other Postretirement Benefit Cost (Details) - Other postretirement benefit plans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Net periodic other postretirement benefit costs
Interest cost	$ 104	$ 72	$ 312	$ 216
Amortization of prior service credit	(68)	(69)	(203)	(207)
Recognition of actuarial loss	48	74	144	223
Net periodic other postretirement benefit cost	$ 84	$ 77	$ 253	$ 232