REVENUE - Additional information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 14.8
Revenue Remaining Performance Obligation Completed Less Than 50		$ 12.8
Revenue, Remaining Performance Obligation, Percentage		50.00%
Revenue Recognized By Contract Liabilities	$ 0.8
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period			3 months
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period			36 months