Consolidated Sponsored Funds (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Oct. 31, 2011
Schedule Of Consolidated Sponsored Funds [Line Items]    
Investments $ 486,933 $ 287,735
Other assets 89,122 74,325
Other liabilities 91,785 75,557
Redeemable non-controlling interests 98,765 100,824
Consolidated Sponsored Funds [Member]
   
Schedule Of Consolidated Sponsored Funds [Line Items]    
Investments 157,405 143,517
Other assets 5,594 13,465
Other liabilities (16,928) (10,764)
Redeemable non-controlling interests (20,072) (25,569)
Net interest in consolidated sponsored funds $ 125,999 $ 120,649