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, 2019	Oct. 31, 2018
Assets of consolidated CLO entities:
Cash	$ 48,704	$ 216,598
Bank loans and other investments	1,704,270	874,304
Other assets	28,039	4,464
Consolidated Securitized CLO Entities [Member]
Assets of consolidated CLO entities:
Cash	48,704	216,598
Bank loans and other investments	1,704,270	874,304
Receivable for pending bank loan sales	24,193	2,535
Other assets	3,846	1,929
Liabilities of consolidated CLO entities:
Senior and subordinated note obligations	1,617,095	873,008
Payable for pending bank loan purchases	33,985	152,152
Other liabilities	17,137	2,033
Total beneficial interests	$ 112,796	$ 68,173