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CONVERTIBLE DEBT: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
May 31, 2013
Feb. 28, 2013
Feb. 29, 2012
Nov. 30, 2012
May 31, 2008
Convertible debt          
Convertible Debt- Current   $ 142,824   $ 141,436  
Contractual interest expense   6,556 6,954    
Long-term Debt, Conversion Circumstances [Abstract]          
Non-cash interest expense   1,388 1,284    
Convertible Debt [Member]
         
Convertible debt          
Aggregate principal amount of convertible senior notes   143,750   143,750 143,750
Less: Unamortized debt discount   (926)   (2,314) (23,418)
Convertible Debt- Current   142,824   141,436  
Stated interest rate         4.00%
Contractual interest expense   1,624 1,624    
Long-term Debt, Contingent Payment of Interest [Abstract]          
Minimum trading price as percentage of principal amount   120.00%      
Contingent interest payable as percentage of average trading price   0.55%      
Long-term Debt, Conversion Circumstances [Abstract]          
Common stock sales price as percentage of conversion price   130.00%      
Maximum trading price per $1 principal amount as percentage of product of common stock sales price and debt conversion rate   98.00%      
Debt conversion rate of common stock per $1 principal amount   33.9945      
Debt conversion price per common stock   $ 29.42      
Redemption price as percentage of principal amount   100.00%      
Non-convertible debt borrowing rate   8.00%      
Estimated fair value         120,332
Debt discount   926   2,314 23,418
Discount amortization period (in years)   5 years      
Remaining amortization period (in months) 3 months        
Non-cash interest expense   1,388 1,284    
Carrying value of equity component of debt   $ 22,836   $ 22,836