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FAIR VALUE MEASUREMENTS (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Investment sales     $ 715,000 $ 8,891,000  
Gain on settlement of available-for-sale securities   $ 489,000      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax   $ 870,000      
Australian Dollar Forward Contract [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Gains recorded in Other Income for settled contracts $ 181   585    
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Contracts Revenue     $ 33,000,000    
Contracts Weighted Average Rate Price     $ 1.30    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Before Tax 2,714,000   $ 2,714,000    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 1,981,000   $ 1,981,000    
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Foreign currency contracts duration     28 days    
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Foreign currency contracts duration     270 days    
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Derivative asset, notional amount $ 4,615,000   $ 4,615,000    
Derivative, average forward exchange rate 1.30   1.30    
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Foreign currency contracts duration     15 days    
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Foreign currency contracts duration     180 days    
Fair Value, Inputs, Level 2 [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Insurance contracts fair value $ 2,935,000   $ 2,935,000    
Fair Value, Inputs, Level 2 [Member] | Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments $ 0   $ (284,000)    
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 $ 115,375,000   $ 115,375,000    
Senior Notes 2022 [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Debt instrument, interest rate, effective percentage 5.25%   5.25%   5.25%
Senior Notes 2022 [Member] | Fair Value, Inputs, Level 1 [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Convertible debt, fair value disclosures $ 588,000,000   $ 588,000,000    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Trading securities 1,200,000   1,200,000    
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Trading securities $ 1,000,000   $ 1,000,000