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Consolidated Sponsored Funds (Tables)
3 Months Ended
Jan. 31, 2018
Consolidated Sponsored Funds Table [Abstract]  
Summary of consolidated sponsored funds
 (in thousands) January 31, 2018 October 31, 2017
 Investments $ 500,766$ 401,726
 Other assets  11,838  13,537
 Other liabilities  (54,240)  (50,314)
 Redeemable non-controlling interests  (215,502)  (154,061)
 Interest in consolidated sponsored funds$ 242,862$ 210,888