DERIVATIVE FINANCIAL INSTRUMENTS, FAIR VALUE OF DERIVATIVE INSTRUMENTS IN THE CONSOLIDATED BALANCE SHEET (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Long-term Assets [Member]
Asset Derivatives [Abstract]
Fair value of foreign exchange contract asset derivatives	$ 0	$ 117
Liability Derivatives [Abstract]
Fair value of foreign exchange contract liability derivatives	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Accrued Expenses and Other Current Liabilities [Member]
Asset Derivatives [Abstract]
Fair value of foreign exchange contract asset derivatives	0	0
Liability Derivatives [Abstract]
Fair value of foreign exchange contract liability derivatives	0	31
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Other Long-term Liabilities [Member]
Asset Derivatives [Abstract]
Fair value of foreign exchange contract asset derivatives	0	0
Liability Derivatives [Abstract]
Fair value of foreign exchange contract liability derivatives	0	1,442
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Asset Derivatives [Abstract]
Fair value of foreign exchange contract asset derivatives	8	146
Liability Derivatives [Abstract]
Fair value of foreign exchange contract liability derivatives	0	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Accrued Expenses and Other Current Liabilities [Member]
Asset Derivatives [Abstract]
Fair value of foreign exchange contract asset derivatives	0	0
Liability Derivatives [Abstract]
Fair value of foreign exchange contract liability derivatives	$ 44	$ 408