PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Land and improvements	$ 788	$ 788
Buildings and improvements	8,910	8,910
Building under capital lease	5,750	0
Machinery and equipment	27,947	26,905
Furniture and fixtures	7,520	7,489
Construction in progress	4,968	3,079
Total property, plant and equipment, at cost	55,883	47,171
Accumulated depreciation	(38,106)	(36,177)
Property, plant and equipment, net	$ 17,777	$ 10,994