BUSINESS SEGMENT INFORMATION - Restructuring liabilitiy and employee separation expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Restructuring liability
Balance at the beginning of the period	$ 1,893	$ 776
Accrued costs	1,852	6,272	$ 1,094
Cash payments	(3,096)	(5,155)
Liability at the end of the period	$ 649	$ 1,893	$ 776