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Variable Interest Entities (Schedule of the balances related to consolidated sponsored funds) (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Oct. 31, 2019
Schedule Of Consolidated Funds [Line Items]    
Investments $ 749,675 $ 898,908
Other assets 129,017 85,087
Other liabilities (47,454) (108,982)
Redeemable non-controlling interests (222,854) (285,915)
Debt And Equity Securities Held By Consolidated Sponsored Funds [Member]    
Schedule Of Consolidated Funds [Line Items]    
Investments 376,098 514,072
Other assets 9,407 16,846
Other liabilities (10,017) (35,488)
Redeemable non-controlling interests (195,451) (260,681)
Net interest in consolidated sponsored funds $ 180,037 $ 234,749