REVENUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Percentage of performance obligations recognized at a point in time (more than)	80.00%
Percentage of performance obligations recognized over time (less than)	20.00%
Net favorable (unfavorable) catch-up adjustments to income from operations	$ (3,000)	$ (2,500)
Accumulated estimated costs to complete loss contracts	$ 9,828		$ 9,790