Compensation Plans - Senior Executive Compensation Plan (Details)	1 Months Ended			12 Months Ended
	Jan. 31, 2023 $ / shares shares	Dec. 31, 2021 USD ($)	Mar. 31, 2021 $ / shares shares	Nov. 30, 2024 USD ($) multiplierAmount tranche $ / shares shares	Nov. 30, 2023 USD ($) $ / shares shares	Nov. 30, 2022 USD ($) $ / shares shares	Nov. 30, 2021 USD ($) shares	Dec. 31, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $					$ 4,000,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				3 years	3 years	3 years	3 years
Grant date fair value | $				$ 18,000,000.0	$ 11,700,000	$ 13,100,000	$ 16,400,000
Shares reserved for stock options and warrants (in shares)								191,757
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period (in years)				3 years	3 years	3 years	3 years
Grant date fair value | $				$ 18,000,000.0	$ 8,800,000	$ 13,100,000	$ 16,400,000
Senior executive compensation plan awards | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in dollars per share) | $ / shares				$ 44.93	$ 30.15	$ 35.44
Grants (in shares)				459,000	1,379,000	537,000
Forfeited (in shares)				0	0	0
Senior executive compensation plan awards | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)							64,369
Forfeited (in shares)							7,476
Senior Executives | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued (in shares)			2,506,266
Stock options, exercise price (in dollars per share) | $ / shares			$ 23.75
Number of vesting tranches | tranche				3
Common shares reserved issuance (in shares)				5,100,000	5,100,000
Senior Executives | Stock options | Jefferies Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable (in shares)					1,688,247
Senior Executives | Stock options | Vitesse Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable (in shares)					152,622
Senior Executives | Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends subject to cash credit, multiplier amount | multiplierAmount				2
Senior Executives | 2019 Plan and 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement, targeted long-term compensation | $				$ 22,500,000
Performance measurement benchmark, growth rate in TSR				9.00%
Performance measurement benchmark, growth rate in ROTDE				9.00%
Performance measurement benchmark, growth rate in TSR and ROTDE (less than)				6.00%
Additional incentive compensation, percentage				75.00%
Performance measurement benchmark, growth rate in TSR and ROTDE (up to)				12.00%
Senior Executives | 2019 Plan and 2020 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement, targeted long-term compensation | $				$ 16,000,000
Performance measurement benchmark, growth rate in TSR				9.00%
Senior Executives | 2019 Plan and 2020 Plan | Long-term cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement, targeted long-term compensation | $				$ 6,500,000
Performance measurement benchmark, growth rate in ROTDE				9.00%
Senior Executives | Senior executive compensation plan awards | Stock options | Jefferies Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued (in shares)	2,532,370
Stock options, exercise price (in dollars per share) | $ / shares	$ 22.69
Senior Executives | Senior executive compensation plan awards | Stock options | Vitesse Energy | Dividend equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued (in shares)	228,933
Stock options, exercise price (in dollars per share) | $ / shares	$ 8.97
Senior Executives | Leadership Continuity Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period (in years)		5 years
Grant date fair value | $		$ 25,000,000
Holding period		3 years