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Variable Interest Entities (Schedule of the Balances Related to Consolidated Sponsored Funds (Details) - USD ($)
$ in Thousands
Oct. 31, 2019
Oct. 31, 2018
Schedule Of Consolidated Funds [Line Items]    
Total investment securities held at fair value $ 898,908 $ 913,352
Other assets 85,087 95,454
Other liabilities (108,982) (131,952)
Redeemable non-controlling interests (285,915) (335,097)
Debt and Equity Securities Held by Consolidated Sponsored Funds [Member]    
Schedule Of Consolidated Funds [Line Items]    
Total investment securities held at fair value 514,072 540,582
Other assets 16,846 15,471
Other liabilities (35,488) (57,286)
Redeemable non-controlling interests (260,681) (244,970)
Net interest in consolidated sponsored funds $ 234,749 $ 253,797