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Cash, Cash Equivalents and Short-Term Investments (Tables)
 9 Months Ended
Aug. 31, 2011
Cash, Cash Equivalents and Short-Term Investments [Abstract]  
Cash, Cash Equivalents and Short-Term Investments
                 
    August 31,     November 30,  
    2011     2010  
Cash and cash equivalents:
               
Cash in banks
  $ 807,414     $ 325,227  
Money market investments
    1,207,536       1,863,771  
 
           
Total cash and cash equivalents
  $ 2,014,950     $ 2,188,998  
 
           
 
               
Cash and securities segregated (1)
  $ 5,321,012     $ 1,636,755  
 
           
 
(1)   Consists of deposits at exchanges and clearing organizations, as well as deposits in accordance with Rule 15c3-3 of the Securities Exchange Act of 1934, which subjects Jefferies as a broker dealer carrying client accounts, to requirements related to maintaining cash or qualified securities in a segregated reserve account for the exclusive benefit of its clients; and Jefferies Bache, LLC which, as a futures commission merchant, is subject to the segregation requirements pursuant to the Commodity Exchange Act.