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Income Taxes (Details) (USD $)
 3 Months Ended 9 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
May 31, 2013
Nov. 30, 2012
May 31, 2012
Income Tax Disclosure [Abstract]              
Income tax benefit $ 700,000 $ 10,700,000 $ 1,800,000 $ 14,800,000      
Income Tax Reconciliation, Tax Settlements   10,800,000          
Deferred tax assets   (1,100,000)          
Income Taxes Receivable, Current 1,400,000   1,400,000        
Unrecognized Tax Benefits         900,000    
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority             4,100,000
Net Increase (reduction) in valuation allowance   7,100,000 (400,000) 35,100,000      
Net deferred tax assets 0   0     0  
Valuation allowance 879,700,000   879,700,000     880,100,000  
Additions to gross unrecognized tax benefits (900,000.0)   900,000.0        
Total amount of unrecognized tax benefits, including interest and penalties 400,000   400,000        
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 $ 400,000   $ 400,000