Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 3)

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Income Taxes (Details 3)
 12 Months Ended
Nov. 30, 2012
United States - Federal Income Tax [Member]
  
Summary of open tax years and ongoing tax examinations  
Examinations in Process N/A
United States - Various States [Member]
  
Summary of open tax years and ongoing tax examinations  
Examinations in Process N/A
Initial examination period [Member] | United States - Federal Income Tax [Member]
  
Summary of open tax years and ongoing tax examinations  
Open Tax Years 2008
Initial examination period [Member] | United States - Various States [Member]
  
Summary of open tax years and ongoing tax examinations  
Open Tax Years 2007
Expiration examination period [Member] | United States - Federal Income Tax [Member]
  
Summary of open tax years and ongoing tax examinations  
Open Tax Years 2011
Expiration examination period [Member] | United States - Various States [Member]
  
Summary of open tax years and ongoing tax examinations  
Open Tax Years 2011