REVENUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	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	$ (4,100)	$ (9,344)
Accumulated estimated costs to complete loss contracts	$ 8,264	$ 8,264	$ 9,790