Schedule I (PARENT COMPANY ONLY) - Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Nov. 30, 2024	Nov. 30, 2023
Assets
Financial instruments owned, at fair value	$ 24,138,274	$ 21,747,473
Investment in subsidiaries	1,385,658	1,239,345
Other assets	3,072,302	2,650,640
Total assets	64,360,309	57,905,161
Liabilities and Equity
Financial instruments sold, not yet purchased, at fair value	11,007,328	11,251,154
Accrued expenses and other liabilities	3,510,831	2,546,211
Long-term debt	13,530,565	9,698,752
Total liabilities	54,134,916	48,102,620
Equity
Preferred shares, par value of $1 per share, authorized 70,000 shares; 55,125 and 42,000 shares issued and outstanding; liquidation preference $$17,500 per share	55	42
Additional paid-in capital	2,104,199	2,044,859
Accumulated other comprehensive loss	(423,131)	(395,545)
Retained earnings	8,270,145	7,849,844
Total Jefferies Financial Group Inc. shareholders' equity	10,156,772	9,709,827
Total liabilities and equity	64,360,309	57,905,161
Nonvoting Common Stock
Equity
Common stock value	0	0
Parent company
Assets
Cash and cash equivalents	1,862,275	2,455,437
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	68,076	68,076
Financial instruments owned, at fair value	117,941	80,567
Investments in and loans to related parties	682,637	630,705
Investment in subsidiaries	7,694,585	7,248,785
Advances to subsidiaries	7,644,604	4,393,104
Subordinated notes receivable	5,463,472	4,277,788
Other assets	1,012,283	1,025,140
Total assets	24,545,873	20,179,602
Liabilities and Equity
Financial instruments sold, not yet purchased, at fair value	5,135	690
Advances from subsidiaries	1,509,676	1,253,151
Accrued expenses and other liabilities	798,194	718,634
Long-term debt	12,076,096	8,497,300
Total liabilities	14,389,101	10,469,775
Equity
Preferred shares, par value of $1 per share, authorized 70,000 shares; 55,125 and 42,000 shares issued and outstanding; liquidation preference $$17,500 per share	55	42
Common stock value	205,504	210,627
Additional paid-in capital	2,104,199	2,044,859
Accumulated other comprehensive loss	(423,131)	(395,545)
Retained earnings	8,270,145	7,849,844
Total Jefferies Financial Group Inc. shareholders' equity	10,156,772	9,709,827
Total liabilities and equity	24,545,873	20,179,602
Parent company | Nonvoting Common Stock
Equity
Common stock value	$ 0	$ 0