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, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Description	0.8 million
Other postretirement benefit plans [Member]
Net periodic other postretirement benefit costs
Interest cost	$ 87	$ 98	$ 175	$ 196
Amortization of prior service credit	(63)	(63)	(127)	(127)
Recognition of actuarial loss	31	34	62	70
Net periodic other postretirement benefit cost	$ 55	$ 69	$ 110	$ 139