Organization and Basis of Presentation - Narrative (Details) $ in Thousands		12 Months Ended
	Sep. 30, 2022 USD ($)	Nov. 30, 2022 USD ($) segment	Nov. 30, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of reportable segments | segment		2
Financial instruments owned		$ 18,666,296	$ 18,024,621	[1]
Financial instruments sold, not yet purchased, at fair value		11,056,477	9,267,090	[1]
Brokers, dealers and clearing organizations		2,628,727	3,952,093	[1]
Brokers, dealers and clearing organizations		1,792,937	2,454,918	[1]
Oak Hill
Schedule of Equity Method Investments [Line Items]
Gain on sale	$ 175,100
Increases/Decreases due to change in accounting policy
Schedule of Equity Method Investments [Line Items]
Financial instruments owned		2,100,000	(1,855,013)
Financial instruments sold, not yet purchased, at fair value		2,800,000	(2,432,377)
Brokers, dealers and clearing organizations		2,400,000	(1,864,422)
Brokers, dealers and clearing organizations		3,100,000	$ (2,441,786)
Disposal group, disposed of by sale, not discontinued operations | Idaho Timber
Schedule of Equity Method Investments [Line Items]
Gain on disposition of business		138,700
Disposal group, disposed of by sale, not discontinued operations | Oak Hill
Schedule of Equity Method Investments [Line Items]
Gain on disposition of business		$ 175,100

[1] See Note 1 for a description of financial statement presentation changes made as a result of our Merger with Jefferies Group.