FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Minimum [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Foreign currency contracts duration		24 days
Maximum [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Foreign currency contracts duration		114 days
Australian Dollar Forward Contracts [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Derivative asset, notional amount	$ 4,172	$ 4,172
Australian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Derivative, average forward exchange rate	1.06	1.06
Canadian Dollar Forward Contracts [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Derivative asset, notional amount	1,750	1,750
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Derivative, average forward exchange rate	1.07	1.07
Fair Value, Inputs, Level 1 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Trading securities	11,160	11,160
Fair Value, Inputs, Level 2 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Insurance contracts fair value	3,594	3,594
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	192	125
Convertible Notes 2017 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Debt instrument, interest rate, effective percentage	4.00%	4.00%
Convertible Notes 2017 [Member] | Fair Value, Inputs, Level 1 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Convertible debt, fair value disclosures	113,400	113,400
Senior Notes 2022 [Member] | Fair Value, Inputs, Level 1 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Convertible debt, fair value disclosures	$ 594,000	$ 594,000