Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Net Periodic Benefit Cost
Interest cost	$ 19	$ 13	$ 55	$ 38
Expected return on plan assets	(2)	(4)	(7)	(11)
Recognized actuarial loss	16	19	48	57
Net periodic benefit cost	$ 33	$ 28	$ 96	$ 84