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INVESTMENTS - SUMMARY OF ACQUISITION-RELATED CONTINGENT CONSIDERATION MEASURED AT FAIR VALUE (Details) - Contingent Consideration - ICAR Vision Systems, S.L. $ in Thousands	12 Months Ended
	Sep. 30, 2018 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
September 30, 2017	$ 354
Issuance of contingent consideration	2,867
Expenses recorded due to changes in fair value	2,105
Payment of contingent consideration	(1,489)
Issuance of common stock	(710)
Foreign currency effect on contingent consideration	(76)
Balance at September 30, 2018	$ 3,051

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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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