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Income Taxes (Details) (USD $)
 3 Months Ended 9 Months Ended
Aug. 31, 2014
Aug. 31, 2013
May 31, 2013
Aug. 31, 2014
Aug. 31, 2013
Nov. 30, 2013
Income Tax Disclosure [Abstract]            
Income tax benefit (expense) $ (300,000) $ 700,000   $ (800,000) $ 1,800,000  
Unrecognized Tax Benefits 300,000     300,000   300,000
Net (increase) reduction in valuation allowance 11,600,000     27,000,000 400,000  
Net deferred tax assets 0     0   0
Valuation allowance 832,400,000     832,400,000   859,400,000
Income Tax Contingency [Line Items]            
Cumulative Earnings (Deficit) 37,100,000     37,100,000    
Income Taxes Receivable, Current     1,400,000      
Other Tax Expense (Benefit)     900,000      
Minimum [Member]
            
Income Tax Contingency [Line Items]            
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 100,000     100,000    
Maximum [Member]
            
Income Tax Contingency [Line Items]            
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 300,000     $ 300,000