Investments - Summary of Selected Financial Information For FXCM (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2022	Nov. 30, 2021		Nov. 30, 2020
Schedule of Equity Method Investments [Line Items]
Total assets	$ 51,057,683	$ 56,107,311	[1]
Total liabilities	40,630,743	45,377,271	[1]
Net earnings	781,710	1,677,376	[1]	$ 768,410	[1]
Investment in FXCM
Schedule of Equity Method Investments [Line Items]
Total assets	389,600	387,900
Total liabilities	341,400	382,200
Net earnings	39,000	(21,500)		$ 6,500
Investment in FXCM
Schedule of Equity Method Investments [Line Items]
Our total equity balance	$ 59,700	$ 49,000

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