Fair Value Disclosures - Narrative (Details) - USD ($)	12 Months Ended
	Nov. 30, 2022	Nov. 30, 2021		Nov. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	$ 111,700,000	$ 21,100,000		$ 122,200,000
Transfers of assets from Level 3 to Level 2	61,500,000	168,700,000		24,200,000
Transfers of liabilities from Level 2 to Level 3	172,100,000	74,300,000		500,000
Transfers of liabilities from Level 3 to Level 2	53,600,000	24,700,000		141,500,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	31,800,000	140,000,000		(46,300,000)
Net gains (losses) on Level 3 liabilities (realized and unrealized)	(465,700,000)	12,900,000		(88,000,000)
Value of asset excluded from significant unobservable inputs	80,200,000	40,800,000
Value of liability excluded from significant unobservable inputs	(9,600,000)	(2,200,000)
Aggregate fair value of loans and other receivables on nonaccrual status and/or 90 days or greater past due	69,200,000	56,900,000
Loan and other receivables greater than 90 days past due	65,100,000	23,500,000
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	957,302,000	1,015,107,000	[1]
Equity securities without readily determinable fair value	37,000,000	119,400,000
Impairment	0	0		20,400,000
Realized investment gains (losses)	3,600,000	800,000		2,100,000
Unrealized gains (losses) on investments	0	0		0
Loans and other receivables
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	33,200,000			45,100,000
Transfers of assets from Level 3 to Level 2	4,500,000			6,600,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	(1,912,000)	1,250,000		(6,203,000)
Other ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	22,600,000	10,200,000		23,000,000
Transfers of assets from Level 3 to Level 2	29,300,000			6,800,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	(6,467,000)	5,335,000		(3,848,000)
CDOs and CLOs
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	11,000,000	7,600,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	7,099,000	8,092,000		(3,821,000)
Corporate debt securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	22,800,000	3,300,000		18,000,000
Transfers of assets from Level 3 to Level 2		17,900,000		3,000,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	946,000	1,565,000		83,000
Net gains (losses) on Level 3 liabilities (realized and unrealized)	(88,000)	(1,205,000)		268,000
RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 3 to Level 2		19,300,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	(13,210,000)	(243,000)		(934,000)
Corporate equity securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	17,900,000			32,500,000
Transfers of assets from Level 3 to Level 2	4,300,000	5,400,000		5,100,000
Transfers of liabilities from Level 3 to Level 2	4,300,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	(645,000)	19,213,000		1,411,000
Net gains (losses) on Level 3 liabilities (realized and unrealized)	3,611,000	83,000		(456,000)
Structured notes
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of liabilities from Level 2 to Level 3	19,300,000	57,900,000
Transfers of liabilities from Level 3 to Level 2	38,900,000			80,600,000
Net derivatives
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of liabilities from Level 2 to Level 3	152,800,000	16,200,000
Transfers of liabilities from Level 3 to Level 2	7,500,000	24,700,000		60,800,000
Net gains (losses) on Level 3 liabilities (realized and unrealized)	181,750,000	(7,246,000)		40,000
Loans
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of liabilities from Level 2 to Level 3				400,000
Net gains (losses) on Level 3 liabilities (realized and unrealized)	(1,197,000)	(3,384,000)		(5,297,000)
CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net gains/(losses) on Level 3 assets (realized and unrealized)	(733,000)	(1,694,000)		(827,000)
Net gains (losses) on Level 3 liabilities (realized and unrealized)	0	0		$ 0
Investments at Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 3 to Level 2	$ 23,400,000	$ 137,500,000

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