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Investments (Tables)
6 Months Ended
Apr. 30, 2012
Investments Table [Abstract]  
Summary of investments
 (in thousands)April 30, 2012  October 31, 2011
  Corporate debt securities$ -  $ 4,832 
  Consolidated funds:       
  Debt securities  55,523    69,083 
  Equity securities  107,638    74,434 
  Separately managed accounts:       
  Debt securities  21,212    11,307 
  Equity securities  39,964    33,553 
  Sponsored funds  37,323    39,841 
  CLO entity  449    278 
  Investments in affiliates  26,246    46,900 
  Other investments  7,507    7,507 
 Total investments$ 295,862  $ 287,735 
Summary of investments classified as trading securities
  April 30, 2012        
  (in thousands)CostFair Value   
   Debt securities$ 74,571 $ 76,735   
   Equity securities  137,100   147,602   
  Total investments$ 211,671 $ 224,337   
           
  October 31, 2011        
  (in thousands)CostFair Value   
   Debt securities$ 83,852 $ 85,222   
   Equity securities  105,230   107,987   
  Total investments$ 189,082 $ 193,209   
Summary of investments classified as available-for-sale securities
April 30, 2012    Gross Unrealized   
(in thousands)Cost Gains Losses Fair Value
Sponsored funds$ 29,141 $ 8,358 $ (176) $ 37,323
            
October 31, 2011    Gross Unrealized   
(in thousands)Cost Gains Losses Fair Value
Sponsored funds$ 34,368 $ 5,518 $ (45) $ 39,841
Summary of realized gains and losses upon disposition of sponsored funds classified as available-for-sale
 Three Months Ended Six Months Ended
 April 30, April 30,
(in thousands)2012 2011 2012 2011
Gains$ 162 $ 85 $ 247 $ 2,106
Losses  (101)   -   (123)   (1,554)
Net realized gains$ 61 $ 85 $ 124 $ 552