Pension and Other Postretirement Benefits - Components of Net Periodic Other Postretirement Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Net periodic other postretirement benefit costs
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement				$ 0
Defined Benefit Plan, Description	0.8 million
Other postretirement benefit plans [Member]
Net periodic other postretirement benefit costs
Interest cost	$ 98	$ 106	$ 196	212
Amortization of prior service credit	(63)	(63)	(127)	(127)
Recognition of actuarial loss	34	35	70	71
Net periodic other postretirement benefit cost	$ 69	$ 78	$ 139	$ 156