Fair Value Disclosures - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Nov. 30, 2022	Nov. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investment	$ 1,293,964	$ 1,046,062
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	17,372,332	16,978,559
Counterparty and cash collateral netting, assets	(3,093,244)	(3,305,756)
Securities received as collateral	100,362	7,289	[1]
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	11,056,477	9,267,090	[1]
Counterparty and Cash Collateral Netting	(2,732,165)	(3,702,200)
Other secured financings	1,712	102,788
Obligation to return securities received as collateral	100,362	7,289	[1]
Long-term debt	1,583,828	1,843,598
Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,497,831	3,113,062
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	2,147,117	1,695,985
Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	4,002,385	3,848,144
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	2,338,191	2,112,259
Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	127,464	611,464
U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,457,595	3,114,079
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,223,637	2,457,420
Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	574,903	509,559
Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,746,363	1,553,285
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	1,651,034	1,528,841
Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,341,816	1,169,723
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		719
Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	443,310	198,752
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	490	210
Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	427,841	430,546
Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,237,916	1,693,731
Derivative, assets
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	349,166	570,472
Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	165,742	165,742
Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	183,311	59,480
Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	1,512,697	1,412,176
Fair value based on net asset value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investment	1,290,000	1,050,000
Level 1
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	7,460,053	6,686,065
Securities received as collateral	100,362	7,289
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	6,201,186	5,066,732
Other secured financings	0	0
Obligation to return securities received as collateral	100,362	7,289
Long-term debt	0	0
Level 1 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,117,327	2,737,255
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	2,097,436	1,671,696
Level 1 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 1 | Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,442,484	3,045,295
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,223,637	2,457,420
Level 1 | Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	896,805	899,086
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	879,909	935,801
Level 1 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		0
Level 1 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 1 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Derivative, assets
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,437	4,429
Level 1 | Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 1 | Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	204	1,815
Level 2
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	12,214,068	12,995,640
Securities received as collateral	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	7,511,976	7,809,289
Other secured financings	0	76,883
Obligation to return securities received as collateral	0	0
Long-term debt	922,705	961,866
Level 2 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	140,157	257,318
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	48,931	19,654
Level 2 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,972,153	3,836,341
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	2,337,691	2,111,777
Level 2 | Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	71,640	579,518
Level 2 | U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	15,111	68,784
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 2 | Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	574,903	509,559
Level 2 | Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	849,558	654,199
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	771,125	593,040
Level 2 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,314,199	1,168,246
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		719
Level 2 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	442,471	196,419
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 2 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	333,164	337,022
Level 2 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,069,041	1,515,314
Level 2 | Derivative, assets
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,427,921	3,861,551
Level 2 | Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,750	11,369
Level 2 | Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	180,147	49,555
Level 2 | Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	4,174,082	5,034,544
Level 3
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	791,455	602,610
Securities received as collateral	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	75,480	93,269
Other secured financings	1,712	25,905
Obligation to return securities received as collateral	0	0
Long-term debt	661,123	881,732
Level 3 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	240,347	118,489
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	750	4,635
Level 3 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	30,232	11,803
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	500	482
Level 3 | Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	55,824	31,946
Level 3 | U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 3 | Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 3 | Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 3 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	27,617	1,477
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		0
Level 3 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	839	2,333
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	490	210
Level 3 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	94,677	93,524
Level 3 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	168,875	178,417
Level 3 | Derivative, assets
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	11,052	10,248
Level 3 | Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	161,992	154,373
Level 3 | Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,164	9,925
Level 3 | Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	$ 70,576	$ 78,017

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