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Non-operating Income (Expense) (Tables)
3 Months Ended
Jan. 31, 2018
Non Operating Income (Expense) Table [Abstract]  
Summary of non-operating income (expense)
   Three Months Ended
   January 31,
 (in thousands) 2018 2017
 Interest and other income$ 9,116$ 4,643
 Net losses on investments and derivatives (1)  (5,545)  (3,936)
 Net foreign currency losses  (973)  (213)
 Gains and other investment income, net  2,598  494
 Interest expense  (5,907)  (7,347)
 Other income (expense) of consolidated CLO entity:    
  Interest income  823  -
  Net gains on bank loans  894  -
   Gains and other investment income, net  1,717  -
   Interest expense  (94)  -
 Total non-operating expense$ (1,686)$ (6,853)
       
 (1) For the three months ended January 31, 2018, includes the $6.5 million loss associated with the Company's determination
  not to exercise the option to acquire an additional 26 percent ownership interest in Hexavest.