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FAIR VALUE MEASUREMENTS (Details)
$ / shares in Units, AUD in Thousands
3 Months Ended 6 Months Ended
Jan. 17, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
Mar. 31, 2017
AUD
Mar. 31, 2017
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Issuance of treasury stock in settlement of convertible debt       $ 48,858,000      
Investment sales   $ 0     $ 715,000    
Australian Dollar Forward Contract [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Gains recorded in Other Income for settled contracts   172,000   $ 821,000      
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Contracts Revenue | AUD     AUD 17,500        
Contracts Weighted Average Rate Price | $ / shares       $ 1.30      
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Before Tax           $ 631,000  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax           $ 401,000  
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration     28 days 28 days      
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration     179 days 179 days      
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Derivative asset, notional amount | AUD     AUD 3,300        
Derivative, average forward exchange rate     1.33     1.33  
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration     28 days 28 days      
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Foreign currency contracts duration     179 days 179 days      
Fair Value, Inputs, Level 2 [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Insurance contracts fair value           $ 3,200,000  
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   110,000   $ (1,000)      
Convertible Notes 2017 [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Debt instrument, interest rate, effective percentage     4.00%     4.00%  
Debt conversion, converted instrument, amount $ 173,855,000            
Debt conversion, converted instrument, cash received 125,000,000            
Issuance of treasury stock in settlement of convertible debt $ 48,858,000            
Debt conversion, converted instrument, shares issued | shares 1,954,993            
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           $ 725,000,000  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Trading securities           1,443,000  
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  
Other Nonoperating Income (Expense) [Member]              
FAIR VALUE MEASUREMENTS (Details) [Line Items]              
Available-for-sale Securities, Gross Realized Losses   13,000          
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)   $ 94,000   $ 53,000