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Basis of Presentation and Significant Accounting Policies (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Numerator:    
Net loss $ (45,802) $ (114,526)
Denominator:    
Basic and diluted average shares outstanding 77,090 76,974
Basic and diluted loss per share $ (0.59) $ (1.49)