Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis Classified as Level 3 (Details) - Bank Loans and Other Investments of Consolidated CLO Entities [Member] - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 1,547	$ 0
Consolidation of CLO entities	1,323	3,935
Paydowns	(25)	(6)
Sales	0	(1,440)
Net gains (losses) included in net income	(48)	114
Transfers out of Level 3 (liability)	1,296	1,056
Ending balance	$ 1,501	$ 1,547