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FAIR VALUE MEASUREMENTS (Details) - USD ($)
3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Gains recorded in Other Income for settled contracts $ 404  
Minimum [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Contracts Expiration Days 31 days  
Foreign currency contracts duration 29 days  
Maximum [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Contracts Expiration Days 270 days  
Foreign currency contracts duration 270 days  
Designated as Hedging Instrument [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Contracts Revenue $ 24,401,000  
Contracts Weighted Average Rate Price $ 1.375  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Before Tax $ 512,000  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 333,000  
Canadian Dollar Forward Contracts [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Derivative asset, notional amount $ 5,300,000  
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Derivative, average forward exchange rate 1.38  
Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Insurance contracts fair value $ 3,038,000  
Fair Value, Inputs, Level 2 [Member] | Canadian Dollar Forward Contracts [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments $ (101,000)  
Convertible Notes 2017 [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Debt instrument, interest rate, effective percentage 4.00%  
Convertible Notes 2017 [Member] | Fair Value, Inputs, Level 1 [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Convertible debt, fair value disclosures $ 128,375,000  
Senior Notes 2022 [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Debt instrument, interest rate, effective percentage 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 $ 570,000,000  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS (Details) [Line Items]    
Trading securities 1,191,000  
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