Investments - Summary of Selected Financial Information for OpNet (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]
OpNet
Schedule of Equity Method Investments [Line Items]
Total assets	1,050,800	782,000
Total liabilities	935,200	734,000
Net earnings	(88,600)	(90,500)		$ (78,800)
OpNet
Schedule of Equity Method Investments [Line Items]
Our total equity balance	$ 0	$ 0

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