Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Payables and Accruals [Abstract]
Accrued postretirement benefits	$ 1,068	$ 810
Accrued workers’ compensation liabilities	1,495	1,698
Short-term pension liabilities(1)	0	3,761
Earnout payable(2)	1,000	600
Working capital dispute payable(3)	354	0
Other(4)	3,392	3,790
Other current liabilities	$ 7,309	$ 10,659