BANK DEPOSITS, Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Bank Deposits [Line Items]
Interest-bearing demand deposits	$ 7,809	$ 5,286
Raymond James & Associates, Inc.
Bank Deposits [Line Items]
Related party deposit liabilities	37,680	$ 38,710
Private Client Group clients
Bank Deposits [Line Items]
Interest-bearing demand deposits	$ 2,750

Amount of deposits held by the entity for a related party (entity, shareholder, employee).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Name:	us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant