Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Net periodic pension income
Settlement	$ 0	$ 0
Pension plans contribution
Net periodic pension income
Service cost	275	229	$ 552	$ 457
Interest cost	8,116	8,514	16,243	17,019
Expected return on plan assets	(9,555)	(10,673)	(19,128)	(21,335)
Amortization of prior service credit	(4)	(2)	(8)	(5)
Recognition of actuarial loss	2,916	2,107	5,840	4,210
Settlement			0	836
Net periodic other postretirement benefit cost	$ 1,748	$ 175	$ 3,499	$ 1,182