|
CONVERTIBLE DEBT: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
|
3 Months Ended |
6 Months Ended |
|
|
|
May 31, 2013
|
May 31, 2012
|
May 31, 2013
|
May 31, 2012
|
Nov. 30, 2012
|
May 31, 2008
|
| Convertible debt |
|
|
|
|
|
|
| Convertible Debt- Current |
$ 143,750 |
|
$ 143,750 |
|
$ 141,436 |
|
| Long-term Debt, Conversion Circumstances [Abstract] |
|
|
|
|
|
|
| Debt Instrument, Convertible, Beneficial Conversion Feature |
35,646 |
|
|
|
|
|
| Non-cash interest expense |
|
|
2,314 |
2,584 |
|
|
|
Convertible Debt [Member]
|
|
|
|
|
|
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| Convertible debt |
|
|
|
|
|
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| Aggregate principal amount of convertible senior notes |
143,750 |
|
143,750 |
|
143,750 |
143,750 |
| Less: Unamortized debt discount |
0 |
|
0 |
|
(2,314) |
|
| Convertible Debt- Current |
143,750 |
|
143,750 |
|
141,436 |
|
| Stated interest rate |
|
|
|
|
|
4.00% |
| 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% |
|
|
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| Debt conversion rate of common stock per $1 principal amount |
|
|
33.9945 |
|
|
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| Debt conversion price per common stock |
$ 29.42 |
|
$ 29.42 |
|
|
|
| Non-convertible debt borrowing rate |
|
|
8.00% |
|
|
|
| Debt discount |
0 |
|
0 |
|
2,314 |
|
| Non-cash interest expense |
926 |
1,301 |
2,314 |
2,585 |
|
|
| Carrying value of equity component of debt |
$ 22,836 |
|
$ 22,836 |
|
$ 22,836 |
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