Common Shares and Earnings Per Common Share - Earnings Per Share Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Nov. 30, 2022	Nov. 30, 2021		Nov. 30, 2020
Numerator for earnings per common share:
Net earnings attributable to Jefferies Financial Group Inc.	$ 777,168	$ 1,667,403	[1]	$ 769,605	[1]
Allocation of earnings to participating securities	(3,015)	(9,961)		(4,795)
Net earnings attributable to Jefferies Financial Group Inc. common shareholders for basic earnings per share	774,153	1,657,442		764,810
Adjustment to allocation of earnings to participating securities related to diluted shares	29	207		23
Mandatorily redeemable convertible preferred share dividends	8,281	6,949		5,634
Net earnings attributable to Jefferies Financial Group Inc. common shareholders for diluted earnings per share	$ 782,463	$ 1,664,598		$ 770,467
Denominator for earnings per common share:
Weighted average common shares outstanding (in shares)	234,258,000	246,991,000		268,518,000
Denominator for basic earnings per share – weighted average shares (in shares)	247,378,000	263,595,000		285,693,000
Mandatorily redeemable convertible preferred shares (in shares)	4,441,000	4,441,000		4,441,000
Denominator for diluted earnings per share (in shares)	255,571,000	271,501,000		290,490,000
Earnings per share, Basic (USD per share)	$ 3.13	$ 6.29	[1]	$ 2.68	[1]
Earnings per share, Diluted (USD per share)	$ 3.06	$ 6.13	[1]	$ 2.65	[1]
Weighted average shares of participating securities (in shares)		1,586,500		1,801,700
Dividends declared on participating securities	$ 1,100	$ 1,400		$ 1,000
Restricted stock with future service required
Denominator for earnings per common share:
Weighted average shares of restricted stock outstanding with future service required (in shares)	(1,330,000)	(1,567,000)		(1,785,000)
Restricted stock units with no future service required
Denominator for earnings per common share:
Weighted average RSUs outstanding with no future service required (in shares)	14,450,000	18,171,000		18,960,000
Stock options
Denominator for earnings per common share:
Dilutive effect of share-based payment arrangements (in shares)	1,518,000	1,203,000		0
Senior executive compensation plan awards | Restricted stock units (RSUs)
Denominator for earnings per common share:
Dilutive effect of share-based payment arrangements (in shares)	2,234,000	2,262,000		356,000

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