Acquisitions, Goodwill and Intangible Assets 3 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Amortizing intangible assets:    
Accumulated amortization $ (58,807) $ (50,811)
Intangible assets    
Gross intangible assets 118,035 118,035
Accumulated amortization (58,807) (50,811)
Intangible assets, net 59,228 67,224
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 110,327 110,327
Accumulated amortization (58,681) (50,749)
Net carrying amount 51,646 59,578
Weighted-average remaining amortization period (in years) 7 years 7 years 11 months
Intangible assets    
Accumulated amortization (58,681) (50,749)
Intellectual Property Acquired [Member]
    
Amortizing intangible assets:    
Gross carrying amount 1,000 1,000
Accumulated amortization (126) (62)
Net carrying amount 874 938
Weighted-average remaining amortization period (in years) 13 years 7 months 14 years 7 months
Intangible assets    
Accumulated amortization $ (126) $ (62)