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FAIR VALUE MEASUREMENTS (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 17, 2017
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2018
AUD ($)
Jun. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Sep. 30, 2017
Australian Dollar Forward Contract [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Gains recorded in Other Income for settled contracts   $ 207,000     $ 174,000    
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Contracts revenue       $ 8,500      
Contracts weighted average rate price (in dollars per share) | $ / shares         $ 1.36    
AOCI currency translation adjustment before tax           $ 864,000  
AOCI currency translation adjustment after tax           $ 612,000  
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration       30 years 30 years    
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration       88 days 88 days    
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Derivative asset, notional amount       $ 1,651      
Derivative, average forward exchange rate       1.31   1.31  
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration       30 days 30 days    
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration       88 days 88 days    
Fair Value, Inputs, Level 2 [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Insurance contracts fair value           $ 2,948,000  
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   (11,000)     $ 81,000    
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           $ 972,500,000  
Convertible Notes 2017 [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Debt instrument, interest rate, effective percentage 4.00%            
Debt conversion, converted instrument, amount $ 173,855,000   $ 173,855,000        
Debt conversion, converted instrument, cash received $ 125,000,000   $ 125,000,000        
Debt conversion, converted instrument, shares issued | shares 1,954,993   1,954,993        
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Trading securities           3,469,000  
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Trading securities           $ 3,086,000  
Other Income [Member] | Fair Value, Inputs, Level 2 [Member] | Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Realized gains (losses)   $ 31,000     $ 11,000