Intangible Assets (Tables)
 6 Months Ended
Apr. 30, 2017
Intangible Assets [Abstract]  
Schedule of the carrying amounts of intangible assets
 April 30, 2017      
 (in thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
        
 Amortizing intangible assets:      
  Client relationships acquired$ 134,247$ (99,159)$ 35,088
  Intellectual property acquired  1,025  (419)  606
  Trademark acquired  4,257  (637)  3,620
  Research system  639  (71)  568
        
 Non-amortizing intangible assets:      
  Mutual fund management contracts acquired  54,408  -  54,408
 Total$ 194,576$ (100,286)$ 94,290

 October 31, 2016      
 (in thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
        
 Amortizing intangible assets:      
  Client relationships acquired$ 133,927$ (94,873)$ 39,054
  Intellectual property acquired  1,025  (385)  640
  Trademark acquired  900  (493)  407
        
 Non-amortizing intangible assets:      
  Mutual fund management contracts acquired  6,708  -  6,708
 Total$ 142,560$ (95,751)$ 46,809
Schedule of estimated amortization expense for the remainder of the fiscal year and the next five fiscal years
   Estimated 
 Year Ending October 31, Amortization 
 (in thousands) Expense 
 Remaining 2017$ 4,478 
 2018  8,927 
 2019  4,978 
 2020  3,807 
 2021  2,282 
 2022  2,154 
Schedule of the carrying amounts of acquired intangible assets
 April 30, 2017        
 (in thousands)Weighted-Average Remaining Amortization Period (in years)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
 Amortizing intangible assets:        
  Client relationships acquired14.7 $ 320$ (7)$ 313
  Trademark acquired13.7   3,357  (80)  3,277
  Research system2.7   639  (71)  568
 Non-amortizing intangible assets:        
  Mutual fund management contracts acquired    47,700  -  47,700
 Total12.3 $ 52,016$ (158)$ 51,858
Schedule of estimated amortization expense associated with acquired intangible assets for the remainder of the fiscal year and the next five fiscal years
   Estimated
 Year Ending October 31, Amortization
 (in thousands) Expense
 Remaining 2017$ 237
 2018  474
 2019  474
 2020  297
 2021  261
 2022  261