Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Nov. 30, 2021
Debt Instrument [Line Items]
Long-term debt	$ 8,896,032		$ 9,125,745
Gains (losses) recognized in interest expense of Jefferies Group	$ 6,544	$ 3,020
5.50% Senior Notes due October 18, 2023
Debt Instrument [Line Items]
Interest rate	5.50%		5.50%
Principal outstanding	$ 441,748		$ 441,748
6.625% Senior Notes due October 23, 2043
Debt Instrument [Line Items]
Interest rate	6.625%		6.625%
Principal outstanding	$ 250,000		$ 250,000
1.00% Euro Medium Term Notes, due July 19, 2024
Debt Instrument [Line Items]
Interest rate	1.00%		1.00%
Principal outstanding	$ 560,975		$ 566,150
4.85% Senior Notes, due January 15, 2027
Debt Instrument [Line Items]
Interest rate	4.85%		4.85%
Principal outstanding	$ 750,000		$ 750,000
6.45% Senior Debentures, due June 8, 2027
Debt Instrument [Line Items]
Interest rate	6.45%		6.45%
Principal outstanding	$ 350,000		$ 350,000
4.15% Senior Notes, due January 23, 2030
Debt Instrument [Line Items]
Interest rate	4.15%		4.15%
Principal outstanding	$ 1,000,000		$ 1,000,000
2.625% Senior Notes, due October 15, 2031
Debt Instrument [Line Items]
Interest rate	2.625%		2.625%
Principal outstanding	$ 1,000,000		$ 1,000,000
2.75% Senior Notes, due October 15, 2032
Debt Instrument [Line Items]
Interest rate	2.75%		2.75%
Principal outstanding	$ 500,000		$ 500,000
6.25% Senior Debentures, due January 15, 2036
Debt Instrument [Line Items]
Interest rate	6.25%		6.25%
Principal outstanding	$ 495,000		$ 495,000
6.50% Senior Notes, due January 20, 2043
Debt Instrument [Line Items]
Interest rate	6.50%		6.50%
Principal outstanding	$ 391,000		$ 391,000
Parent company
Debt Instrument [Line Items]
Long-term debt	687,234		687,008
Parent company | 5.50% Senior Notes due October 18, 2023
Debt Instrument [Line Items]
Long-term debt	440,330		440,120
Parent company | 6.625% Senior Notes due October 23, 2043
Debt Instrument [Line Items]
Long-term debt	246,904		246,888
Subsidiaries
Debt Instrument [Line Items]
Long-term debt	8,208,798		8,438,737
Subsidiaries | 1.00% Euro Medium Term Notes, due July 19, 2024 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	559,925		564,985
Subsidiaries | 4.85% Senior Notes, due January 15, 2027 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	757,872		775,550
Subsidiaries | 6.45% Senior Debentures, due June 8, 2027 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	365,909		366,556
Subsidiaries | 4.15% Senior Notes, due January 23, 2030 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	990,769		990,525
Subsidiaries | 2.625% Senior Notes, due October 15, 2031 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	970,927		988,059
Subsidiaries | 2.75% Senior Notes, due October 15, 2032 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	445,542		460,724
Subsidiaries | 6.25% Senior Debentures, due January 15, 2036 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	505,151		505,267
Subsidiaries | 6.50% Senior Notes, due January 20, 2043 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	409,815		409,926
Subsidiaries | Floating Rate Senior Notes, due October 29, 2071 | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	61,706		61,703
Subsidiaries | Jefferies Group Unsecured Revolving Credit Facility | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	349,105		348,951
Subsidiaries | Structured Notes | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	1,762,163		1,843,598
Subsidiaries | Jefferies Group Secured Credit Facilities | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	609,091		706,608
Subsidiaries | Jefferies Group Secured Bank Loan | Jefferies Group
Debt Instrument [Line Items]
Long-term debt	100,000		100,000
Subsidiaries | HomeFed EB-5 Program debt
Debt Instrument [Line Items]
Long-term debt	207,471		203,132
Subsidiaries | HomeFed construction loans
Debt Instrument [Line Items]
Long-term debt	45,716		45,581
Subsidiaries | Vitesse Energy Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	67,636		67,572
Subsidiaries | 4.85% Senior Notes, due January 15, 2027 and 2.75% Senior Notes, due October 15, 2032 | Interest rate swaps
Debt Instrument [Line Items]
Gains (losses) recognized in interest expense of Jefferies Group	$ 50,500	$ 46,800
Subsidiaries | Foursight Capital | Jefferies Group Secured Credit Facilities
Debt Instrument [Line Items]
Long-term debt			$ 82,600