Variable Interest Entities (Summary of the carrying amounts related to vie that are consolidated on the companys balance sheet) (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Oct. 31, 2019
Consolidated Securitized CLO Entities [Member]
Assets of consolidated CLO entities:
Cash	$ 91,458	$ 48,704
Bank loans and other investments	1,698,155	1,704,270
Receivable for pending bank loan sales	23,885	24,193
Other assets	3,683	3,846
Liabilities of consolidated CLO entities:
Senior and subordinated note obligations	1,616,243	1,617,095
Line of credit	0	0
Payable for pending bank loan purchases	108,178	33,985
Other liabilities	7,095	17,137
Total beneficial interests	85,665	$ 112,796
Consolidated Warehouse CLO Entities [Member]
Assets of consolidated CLO entities:
Cash	337
Bank loans and other investments	365,978
Receivable for pending bank loan sales	0
Other assets	476
Liabilities of consolidated CLO entities:
Senior and subordinated note obligations	0
Line of credit	43,625
Payable for pending bank loan purchases	284,270
Other liabilities	19
Total beneficial interests	$ 38,877