FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Derivative, Average Forward Exchange Rate	1.10	1.10
Fair Value, Inputs, Level 1 [Member] | Convertible Notes 2017 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Convertible Debt, Fair Value Disclosures	$ 111,300	$ 111,300
Fair Value, Inputs, Level 1 [Member] | Senior Notes 2022 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Convertible Debt, Fair Value Disclosures	591,000	591,000
Fair Value, Inputs, Level 2 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Insurance Contracts Fair Value	3,644	3,644
Trading Securities	1,321	1,321
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	16	54
Convertible Notes 2017 [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.00%	4.00%
Australian Dollar Forward Contracts [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Derivative Asset, Notional Amount	$ 3,861	$ 3,861
Minimum [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Foreign Currency Contracts Duration	15 days	15 days
Maximum [Member]
FAIR VALUE MEASUREMENTS (Details) [Line Items]
Foreign Currency Contracts Duration	80 days	80 days