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FAIR VALUE MEASUREMENTS (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
3 Months Ended
Dec. 31, 2018
AUD ($)
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Contracts revenue   $ 510,522 $ 437,303  
Australian Dollar Forward Contract [Member]        
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Gains recorded in Other Income for settled contracts   $ 692    
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member]        
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Contracts revenue $ 16,000      
Contracts weighted average rate price (in dollars per share) | $ / shares   $ 1.42    
AOCI currency translation adjustment before tax       $ 881
AOCI currency translation adjustment after tax       $ 574
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 150 days 150 days    
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]        
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Derivative asset, notional amount $ 940      
Derivative, average forward exchange rate 1.36     1.36
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 210 days 210 days    
Fair Value, Inputs, Level 2 [Member]        
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Insurance contracts fair value       $ 1,975
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   $ (41)    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]        
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Trading securities       2,567
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]        
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Trading securities       2,086
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)   $ (10)    
Senior notes due 2022 [Member] | Fair Value, Inputs, Level 1 [Member]        
FAIR VALUE MEASUREMENTS (Details) [Line Items]        
Convertible debt, fair value disclosures       $ 910,000