Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - Pension plans contribution [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Net periodic pension income
Service cost	$ 281	$ 419	$ 567	$ 836
Interest cost	5,641	5,783	11,300	11,557
Expected return on plan assets	(12,999)	(13,365)	(26,035)	(26,711)
Amortization of transition obligation	24	23	48	45
Amortization of prior service cost (credit)	3	8	5	17
Recognition of actuarial losses	2,941	3,386	5,911	6,758
Net periodic pension income	$ (4,109)	$ (3,746)	$ (8,204)	$ (7,498)