Non-Controlling and Other Beneficial Interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Noncontrolling Interest [Line Items]
Net income attributable to non-controlling and other beneficial interests	$ (32,841)	$ (15,967)	$ (24,242)
Debt and Equity Securities Held by Consolidated Sponsored Funds [Member]
Noncontrolling Interest [Line Items]
Net income attributable to non-controlling and other beneficial interests	(20,081)	232	(6,816)
Majority-owned subsidiaries [Member]
Noncontrolling Interest [Line Items]
Net income attributable to non-controlling and other beneficial interests	(12,760)	(16,199)	(16,895)
Non-controlling interest value adjustments [Member]
Noncontrolling Interest [Line Items]
Net income attributable to non-controlling and other beneficial interests	$ 0	$ 0	$ (531)