Pension and Other Postretirement Benefits - Amounts Related to Other Postretirement Benefit Plans Recognized in Accumulated Other Comprehensive (Loss) Income (Details) - Other postretirement benefit plans [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized Net Actuarial Losses	$ 4,602	$ 4,150
Unrecognized Net Prior Service Credits	(2,200)	(2,476)
Total	$ 2,402	$ 1,674