Pension and Other Postretirement Benefits - Components of Net Periodic Pension (Income) Cost (Details) - Pension plans contribution [Member] - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Net periodic pension income
Service cost	$ 1,635	$ 2,908	$ 4,640
Interest cost	30,751	31,113	37,726
Expected Return on Plans' Assets	(56,579)	(58,781)	(58,523)
Amortization of transition obligation	94	89	80
Amortization of prior service cost	48	(452)	(417)
Special termination benefit charge	0	98	334
Settlement Loss	626	379	227
Recognition of actuarial losses	6,907	8,356	7,286
Net Periodic Benefit (Income) Cost	$ (16,518)	$ (16,290)	$ (8,647)