Regulatory Requirements (Details) $ in Millions	Oct. 31, 2020 USD ($)
Regulatory Capital Requirements [Abstract]
Net capital	$ 147.9
Minimum net capital requirement	$ 3.7
Ratio of aggregate indebtedness to net capital	0.38

Minimum amount of net capital required to be maintained by broker-dealer subsidiary to engage in security transaction, calculated under Aggregate Indebtedness Standard.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Name:	srt_MinimumNetCapitalRequiredForBrokerDealerSubsidiary1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant