Variable Interest Entities (Summary of the Carrying Amounts Related to VIE that are Consolidated on the Companys Balance Sheet) (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Assets of consolidated CLO entities:
Cash	$ 21,439	$ 48,704
Bank loans and other investments	1,290,583	1,704,270
Other assets	13,658	28,039
Consolidated Securitized CLO Entities [Member]
Assets of consolidated CLO entities:
Cash	21,439	48,704
Bank loans and other investments	1,290,583	1,704,270
Receivable for pending bank loan sales	10,870	24,193
Other assets	2,788	3,846
Liabilities of consolidated CLO entities:
Senior and subordinated note obligations	1,218,216	1,617,095
Payable for pending bank loan purchases	19,731	33,985
Other liabilities	11,116	17,137
Total beneficial interests	$ 76,617	$ 112,796