Related Party Transactions (Summary of sales proceeds and net realized gains (losses) from investments in non-consolidated sponsored funds) (Details) - USD ($) $ in Thousands	3 Months Ended
Jan. 31, 2020	Jan. 31, 2019
Related Party Transaction [Line Items]
Proceeds from sales	$ 1	$ (4,282)
Net realized gains	$ 5	$ 24

The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Name:	us-gaap_PaymentsForProceedsFromInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration