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INCOME TAXES - UNRECOGNIZED TAX BENEFITS ROLLFORWARD (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits at the beginning of the year	$ 1,181	$ 0	$ 0
Additions from tax positions taken in the current year	140	140	0
Additions from tax positions taken in prior years	0	1,041	0
Reductions from tax positions taken in prior years	0	0	0
Tax settlements	0	0	0
Gross unrecognized tax benefits at end of the year	1,321	$ 1,181	$ 0
Unrecognized tax benefits that will impact the company's effective tax rate	$ 1,300

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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