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CONVERTIBLE DEBT: (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|---|---|---|
|
May 31, 2014
|
May 31, 2013
|
May 31, 2014
|
May 31, 2013
|
May 31, 2008
|
Aug. 31, 2013
Convertible Debt [Member]
|
May 31, 2008
Convertible Debt [Member]
|
May 31, 2013
Convertible Debt [Member]
|
May 31, 2013
Convertible Debt [Member]
|
|
| Convertible debt | |||||||||
| Aggregate principal amount of convertible senior notes | $ 143,750 | ||||||||
| Convertible senior notes stated interest rate | 4.00% | 4.00% | |||||||
| Total settlement amount of convertible debt | 218,870 | ||||||||
| Total payments for conversion premium | 0 | (21,745) | 75,120 | ||||||
| Long-term Debt, Conversion Circumstances [Abstract] | |||||||||
| Debt conversion rate of common stock per $1 principal amount | 33.9945 | ||||||||
| Debt conversion price per common stock | $ 29.42 | ||||||||
| Interest Expense, Debt | 6,708 | 5,757 | 12,301 | 12,313 | 1,387 | 3,011 | |||
| Non-convertible debt borrowing rate | 8.00% | ||||||||
| Non-cash interest expense | $ 0 | $ 2,314 | $ 926 | $ 2,314 | |||||