Related Party Transactions - Jefferies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021	Nov. 30, 2021
Related Party Transaction [Line Items]
Payables-brokers, dealers and clearing organizations	$ 6,297,362,000		$ 6,297,362,000		$ 5,814,066,000
Financial instruments sold, not yet purchased	11,533,058,000		11,533,058,000		11,690,795,000
Principal transactions	217,188,000	$ 225,797,000	700,571,000	$ 1,342,075,000
Floor brokerage and clearing fees	84,686,000	69,129,000	262,663,000	222,326,000
Corporate debt securities
Related Party Transaction [Line Items]
Financial instruments sold, not yet purchased	1,940,891,000		1,940,891,000		2,112,259,000
Jefferies | Broker-dealer payable to customer
Related Party Transaction [Line Items]
Customer account payables	1,000,000		1,000,000		500,000
Affiliated entity | Jefferies
Related Party Transaction [Line Items]
Charges to Jefferies for services provided	6,200,000	6,700,000	19,400,000	30,600,000
Charges from Jefferies for services received	2,400,000	8,100,000	10,400,000	26,500,000
Receivable from Jefferies	500,000		500,000		300,000
Payable to Jefferies	2,900,000		2,900,000		10,900,000
Accrued distributions payable	33,300,000		33,300,000
Tax receivable	54,300,000		54,300,000		130,600,000
Net gain (loss) on investments			0
Securities purchased from Jefferies		0		17,100,000
Securities sold to Jefferies		0		500,000
Payables-brokers, dealers and clearing organizations	600,000		600,000		700,000
Affiliated entity | Jefferies | Corporate debt securities
Related Party Transaction [Line Items]
Financial instruments sold, not yet purchased					2,300,000
Affiliated entity | Jefferies | Investment banking
Related Party Transaction [Line Items]
Charges to Jefferies for services provided	5,300,000	21,500,000	5,700,000	45,600,000
Affiliated entity | Jefferies | Commissions and other fees
Related Party Transaction [Line Items]
Charges to Jefferies for services provided	200,000	200,000	800,000	700,000
Affiliated entity | Jefferies | Distribution based on earnings
Related Party Transaction [Line Items]
Payments of distributions to affiliates			433,800,000
Affiliated entity | Jefferies | Payments on current tax receivables and payables
Related Party Transaction [Line Items]
Payments of distributions to affiliates			45,000,000
Affiliated entity | Subsidiary of Jefferies Financial Group Inc.
Related Party Transaction [Line Items]
Net gains on foreign exchange contracts		0		100,000
Affiliated entity | Subsidiary of Jefferies Financial Group Inc. | Corporate debt securities
Related Party Transaction [Line Items]
Principal transactions	600,000	100,000	3,000,000.0	200,000
Floor brokerage and clearing fees	200,000	400,000	500,000	700,000
Affiliated entity | Monashee
Related Party Transaction [Line Items]
Investment in related party	16,300,000		16,300,000		$ 13,600,000
Affiliated entity | Oak Hill
Related Party Transaction [Line Items]
Investment in related party	3,900,000		3,900,000
Affiliated entity | Affiliate of Jefferies Financial Group Inc.
Related Party Transaction [Line Items]
Payments for rent and other expenses	$ 0	$ 200,000	$ 300,000	$ 600,000