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
	Sep. 30, 2022	Sep. 30, 2021
Net periodic other postretirement benefit costs
Interest cost	$ 104	$ 72
Amortization of prior service credit	(68)	(69)
Recognition of actuarial loss	48	74
Net periodic other postretirement benefit cost	$ 84	$ 77