Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - Pension plans contribution [Member] - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net periodic pension income
Service cost	$ 416	$ 450
Interest cost	5,775	6,824
Expected return on plan assets	(13,346)	(13,456)
Amortization of transition obligation	23	22
Amortization of prior service cost (credit)	8	12
Recognition of actuarial losses	3,372	2,595
Settlement gain	0	(122)
Net periodic pension income	$ (3,752)	$ (3,675)