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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 6 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Numerator:        
Net loss $ (24,136) $ (68,504) $ (69,938) $ (183,030)
Denominator:        
Basic and diluted average shares outstanding 77,105 76,991 77,097 76,983
Basic and diluted loss per share $ (0.31) $ (0.89) $ (0.91) $ (2.38)