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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Level 3 reconciliation (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Reconciliation of changes in the fair value of our financial assets and liabilities
Net liabilities at beginning of period	$ 12,147	$ 17,356	$ 11,160	$ 14,879
Additions			673
Included in earnings	(3,132)	1,346	(2,818)	5,323
Settlements		(3,000)		(4,500)
Net liabilities at end of period	$ 9,015	$ 15,702	$ 9,015	$ 15,702

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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