Fair Value Disclosures - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021	Nov. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	$ 76,800	$ 37,900	$ 98,800	$ 50,900
Transfers of assets from Level 3 to Level 2	27,600	36,600	27,400	48,200
Transfers of liabilities from Level 2 to Level 3	112,100	51,800	264,700	100,000
Transfers of liabilities from Level 3 to Level 2	17,700	140,300	46,900	14,600
Net gains/(losses) on Level 3 assets (realized and unrealized)	10,900	16,800	65,700	50,600
Net gains/(losses) on Level 3 liabilities (realized and unrealized)	83,000	(3,700)	473,300	(60,200)
Value of asset excluded from significant unobservable inputs	49,300		49,300		$ 14,300
Value of liability excluded from significant unobservable inputs	6,500		6,500		2,200
Aggregate fair value of loans and other receivables on nonaccrual status and/or 90 days or greater past due	207,300		207,300		56,900
Loans and other receivables greater than 90 days past due	131,500		131,500		$ 23,500
CDOs and CLOs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3		8,000	7,800	7,600
Transfers of assets from Level 3 to Level 2	5,600
Net gains/(losses) on Level 3 assets (realized and unrealized)	685	2,539	2,573	6,745
Net gains/(losses) on Level 3 liabilities (realized and unrealized)	29		29
Other ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	9,200	13,700	23,700	12,500
Transfers of assets from Level 3 to Level 2	4,900	10,700	21,500	6,000
Net gains/(losses) on Level 3 assets (realized and unrealized)	(1,800)	30	(1,446)	4,770
Loans and other receivables
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	6,300	13,400	9,600	17,400
Transfers of assets from Level 3 to Level 2	13,400	21,500		4,900
Net gains/(losses) on Level 3 assets (realized and unrealized)	1,616	(463)	(6,635)	10,062
Corporate debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3		2,500	6,700
Transfers of assets from Level 3 to Level 2	2,100			17,500
Net gains/(losses) on Level 3 assets (realized and unrealized)	(605)	405	3,596	1,600
Net gains/(losses) on Level 3 liabilities (realized and unrealized)	(26)	7	(15)	(375)
Corporate equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3				10,200
Net gains/(losses) on Level 3 assets (realized and unrealized)	(2,161)	14,302	46,147	29,430
Net gains/(losses) on Level 3 liabilities (realized and unrealized)	278	75	3,708	12
Net derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of liabilities from Level 2 to Level 3	49,400	32,900	143,900	73,400
Transfers of liabilities from Level 3 to Level 2	5,700	112,500	7,000	14,600
Net gains/(losses) on Level 3 liabilities (realized and unrealized)	23,380	(20,869)	152,927	(33,173)
Structured notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of liabilities from Level 2 to Level 3	52,000	9,200	105,800	26,300
Transfers of liabilities from Level 3 to Level 2	10,800	23,900	38,900
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of liabilities from Level 2 to Level 3	10,600	9,700	15,000
Net gains/(losses) on Level 3 liabilities (realized and unrealized)	(157)	8	(94)	(1,308)
RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	28,200
Transfers of assets from Level 3 to Level 2		4,100		19,300
Net gains/(losses) on Level 3 assets (realized and unrealized)	(3,596)	(42)	(6,099)	(195)
Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers of assets from Level 2 to Level 3	32,400		47,800
Net gains/(losses) on Level 3 assets (realized and unrealized)	(2,663)	(103)	(18,549)	134
Net gains/(losses) on Level 3 liabilities (realized and unrealized)	$ 0	$ 0	$ 0	$ 0