Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Net periodic pension income
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement				$ 0
Pension plans contribution [Member]
Net periodic pension income
Service cost	$ 229	$ 293	$ 457	590
Interest cost	8,514	8,857	17,019	17,764
Expected return on plan assets	(10,673)	(11,125)	(21,335)	(22,286)
Amortization of transition obligation	0	19	0	38
Amortization of prior service cost (credit)	(2)	(1)	(5)	(2)
Recognition of actuarial losses	2,107	1,428	4,210	2,872
Net periodic pension income	$ 175	$ 529	(1,182)	1,024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ 836	$ 0