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Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Tables)
3 Months Ended
Jan. 31, 2017
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis Tables [Abstract]  
Summary of financial assets and liabilites measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy
 January 31, 2017          
 (in thousands) Level 1 Level 2 Level 3 Other Assets Not Held at Fair Value  Total
 Financial assets:          
  Cash equivalents$ 17,923$ 31,086$ -$ -$ 49,009
  Investments:          
  Investment securities, trading:          
  Short-term debt securities  -  68,915  -  -  68,915
  Other debt securities  24,470  229,484  -  -  253,954
  Equity securities  161,567  44,102  -  -  205,669
  Investment securities, available-          
  for-sale  7,755  2,393  -  -  10,148
  Investments in non-consolidated          
  CLO entities(1)  -  -  -  3,927  3,927
  Investments in equity method          
  investees(2)  -  -  -  143,430  143,430
  Investments, other(3)  -  120  -  19,034  19,154
  Derivative instruments  -  329  -  -  329
 Total financial assets$ 211,715$ 376,429$ -$ 166,391$ 754,535
            
 Financial liabilities:          
  Derivative instruments$ -$ 3,951$ -$ -$ 3,951
 Total financial liabilities$ -$ 3,951$ -$ -$ 3,951

 October 31, 2016          
 (in thousands) Level 1 Level 2 Level 3 Other Assets Not Held at Fair Value  Total
 Financial assets:          
  Cash equivalents$ 21,875$ 35,913$ -$ -$ 57,788
  Investments:          
  Investment securities, trading:          
  Short-term debt securities  -  85,822  -  -  85,822
  Other debt securities  18,757  172,931  -  -  191,688
  Equity securities  93,491  42,540  -  -  136,031
  Investment securities, available-          
  for-sale  11,051  2,261  -  -  13,312
  Investments in non-consolidated          
  CLO entities(1)  -  -  -  3,837  3,837
  Investments in equity method          
  investees(2)  -  -  -  139,929  139,929
  Investments, other(3)  -  120  -  19,034  19,154
  Derivative instruments  -  2,072  -  -  2,072
 Total financial assets$ 145,174$ 341,659$ -$ 162,800$ 649,633
            
 Financial liabilities:          
  Derivative instruments$ -$ 815$ -$ -$ 815
 Total financial liabilities$ -$ 815$ -$ -$ 815
            
 (1) The Company’s investments in these CLO entities are measured at fair value on a non-recurring basis using Level 3 inputs.
 (1) The investments are carried at amortized cost unless facts and circumstances indicate that the investments have been
 (1) impaired, at which time the investments are written down to fair value. The Company did not recognize any impairment
 (1) losses on investments in non-consolidated CLO entities during the three months ended January 31, 2017 or 2016.
 (2) Investments in equity method investees are not measured at fair value in accordance with U.S. GAAP.
 (3) Investments, other, include investments carried at cost that are not measured at fair value in accordance with U.S. GAAP.
Summary of fair value transfers between Level 1 and Level 2 of the fair value measurement hierarchy
  Three Months Ended
  January 31,
 (in thousands) 2017 2016
 Transfers from Level 1 into Level 2(1)$ 356$ 44
 Transfers from Level 2 into Level 1(2)  4  19
      
 (1) Transfers from Level 1 into Level 2 represent securities for which unadjusted quoted market prices in active markets
 (1) became unavailable.
 (2) Transfers from Level 2 into Level 1 represent securities for which unadjusted quoted market prices in active markets
 (2) became available.
Summary of the changes in Level 3 assets and liabilities measured at fair value on a recurring basis
  Three Months Ended
  January 31, 2016
 (in thousands) Bank Loan Investments of Eaton Vance CLO 2015-1 Senior and Subordinated Note Obligations of Eaton Vance CLO 2015-1
 Beginning balance$ -$ -
 Transfers into Level 3(1)  700  390,654
 Ending balance$ 700$ 390,654
 Change in unrealized gains (losses) included in net    
  income relating to assets and liabilities held$ -$ -
      
 (1) Transfers into Level 3 were the result of a reduction in the availability of significant observable inputs used in
 (1) determining the fair value of certain instruments.