FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Money Market Funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	$ 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value		$ 16,470
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value		$ 16,470