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Consolidated Sponsored Funds (Details) - USD ($)
$ in Thousands
Jan. 31, 2018
Oct. 31, 2017
Schedule Of Consolidated Funds [Line Items]    
Investments $ 1,029,738 $ 898,192
Other assets 59,381 83,348
Other liabilities (114,439) (116,298)
Redeemable non-controlling interests (304,449) (250,823)
Consolidated Sponsored Funds [Member]    
Schedule Of Consolidated Funds [Line Items]    
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