Acquisitions, Goodwill and Intangible Assets 3 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Oct. 31, 2011
Y
Oct. 31, 2010
Y
Amortizing intangible assets:    
Accumulated amortization $ (50,811) $ (42,867)
Intangible assets    
Gross intangible assets 118,035 115,885
Accumulated amortization (50,811) (42,867)
Intangible assets, net 67,224 73,018
Mutual Fund Management Contract Acquired [Member]
    
Non-amortizing intangible assets:    
Net carrying amount 6,708 6,708
Client Relationships Acquired [Member]
    
Amortizing intangible assets:    
Gross carrying amount 110,327 109,177
Accumulated amortization (50,749) (42,867)
Net carrying amount 59,578 66,310
Weighted-average remaining amortization period (in years) 7.9 8.8
Intangible assets    
Accumulated amortization (50,749) (42,867)
Intellectual Property Acquired [Member]
    
Amortizing intangible assets:    
Gross carrying amount 1,000  
Accumulated amortization (62)  
Net carrying amount 938  
Weighted-average remaining amortization period (in years) 14.6  
Intangible assets    
Accumulated amortization $ (62)