Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Summary of the changes in Level 3 assets and liabilities measured at fair value on a recurring basis) (Details) - Bank Loans And Other Investments Of Consolidated CLO Entities [Member] - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 1,501	$ 1,547
Consolidation of CLO entities	0	1,323
Paydowns	(19)	(25)
Purchases	444	0
Sales	(634)	0
Net gains (losses) included in net income	(541)	(48)
Transfers out of Level 3	(2,349)	(1,296)
Transfers into Level 3	2,308	0
Ending balance	$ 710	$ 1,501