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FAIR VALUE MEASUREMENTS (Details)
$ / shares in Units, AUD in Thousands
3 Months Ended 9 Months Ended
Jan. 17, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
shares
Dec. 31, 2015
USD ($)
Jun. 30, 2017
AUD
Jun. 30, 2017
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
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   $ 88,000       $ 910,000      
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member]                  
FAIR VALUE MEASUREMENTS (Details) [Line Items]                  
Contracts Revenue | AUD         AUD 15,000        
Contracts Weighted Average Rate Price | $ / shares           $ 1.30      
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Before Tax               $ 318,000  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax               $ 203,000  
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]                  
FAIR VALUE MEASUREMENTS (Details) [Line Items]                  
Foreign currency contracts duration         3 days 3 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 5,290        
Derivative, average forward exchange rate         1.29     1.29  
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         448 days 448 days      
Fair Value, Inputs, Level 2 [Member]                  
FAIR VALUE MEASUREMENTS (Details) [Line Items]                  
Insurance contracts fair value               $ 3,125,000  
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   (217,000)       $ (216,000)      
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            
Issuance of treasury stock in settlement of convertible debt $ 48,858,000                
Debt conversion, converted instrument, shares issued | shares 1,954,993   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               $ 742,255,000  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]                  
FAIR VALUE MEASUREMENTS (Details) [Line Items]                  
Trading securities               1,498,000  
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)   $ 197,000       $ 250,000