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FAIR VALUE MEASUREMENTS (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Investment sales (purchases)   $ 8,891,000 $ 8,891,000 $ (8,402,000)  
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      
Gains recorded in Other Income for settled contracts $ 281   $ 520    
Minimum [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Foreign currency contracts duration     48 days    
Maximum [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Foreign currency contracts duration     108 days    
Designated as Hedging Instrument [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Contracts Revenue     $ 12,851,000    
Contracts Weighted Average Rate Price     $ 1.31    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Before Tax 439,000   $ 439,000    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 307,000   307,000    
Gain (loss) recorded in Other Income for settled contracts 78,000   164,000    
Canadian Dollar Forward Contracts [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Derivative asset, notional amount $ 1,698,000   $ 1,698,000    
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Derivative, average forward exchange rate 1.25   1.25    
Fair Value, Inputs, Level 2 [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Insurance contracts fair value $ 3,285,000   $ 3,285,000    
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     $ (159,000)    
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 $ 122,250,000   $ 122,250,000    
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 $ 591,000,000   $ 591,000,000    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]          
FAIR VALUE MEASUREMENTS (Details) [Line Items]          
Trading securities 1,231,000   1,231,000    
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