Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Payables and Accruals [Abstract]
Accrued postretirement benefits	$ 1,060	$ 1,051
Accrued workers’ compensation liabilities	3,225	2,382
Short-term pension liabilities	347	347
Earnout payable—RLC acquisition	100	100
Other (including net taxes payable)	2,214	2,272
Other current liabilities	$ 6,946	$ 6,152