INTANGIBLE ASSETS - Intangibles (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 8,340	$ 7,528
Accumulated Amortization	3,115	2,685
Carrying Value	5,225	4,843
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	7,585	6,818
Accumulated Amortization	3,111	2,685
Carrying Value	$ 4,474	$ 4,133
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (years)	3 years	3 years
Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (years)	10 years	10 years
Software license
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 45
Accumulated Amortization	4
Carrying Value	$ 41
Estimated Useful Life (years)	3 years
Gilman brand name
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 710	$ 710
Accumulated Amortization	0	0
Carrying Value	$ 710	$ 710