Fair Value Disclosures - Analysis of Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Nov. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	$ 64,800	$ 75,800
Transfers of assets from Level 3 to Level 2	40,500	68,900
Transfers of liabilities from Level 2 to Level 3	72,600	236,700
Transfers of liabilities from Level 3 to Level 2	72,100	13,300
Net gains (losses) on Level 3 assets (realized and unrealized)	21,600	102,200
Net gains (losses) on Level 3 liabilities (realized and unrealized)	161,400	(72,100)
Excluded assets from unobservable quantitative information	45,000		$ 40,800
Excluded liabilities from unobservable quantitative information	13,400		$ 2,200
CDOs and CLOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	18,800	14,600
Transfers of assets from Level 3 to Level 2	9,000
Net gains (losses) on Level 3 assets (realized and unrealized)	(671)	3,840
Loans and other receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	16,100	42,900
Transfers of assets from Level 3 to Level 2	2,400	6,800
Net gains (losses) on Level 3 assets (realized and unrealized)	(4,737)	14,077
Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	12,900	7,500
Transfers of assets from Level 3 to Level 2	28,900	14,500
Net gains (losses) on Level 3 assets (realized and unrealized)	2,033	2,361
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	9,400
Transfers of assets from Level 3 to Level 2		17,500
Transfers of liabilities from Level 2 to Level 3	12,400
Net gains (losses) on Level 3 assets (realized and unrealized)	(1,176)	266
Net gains (losses) on Level 3 liabilities (realized and unrealized)	8,866	(1,430)
Corporate equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	7,400	9,900
Net gains (losses) on Level 3 assets (realized and unrealized)	1,824	2,339
Net gains (losses) on Level 3 liabilities (realized and unrealized)	3,447	(9)
Net derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of liabilities from Level 2 to Level 3	27,900	236,500
Transfers of liabilities from Level 3 to Level 2	28,100	13,300
Net gains (losses) on Level 3 liabilities (realized and unrealized)	54,836	(43,727)
Structured notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of liabilities from Level 2 to Level 3	25,800
Transfers of liabilities from Level 3 to Level 2	44,000
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of liabilities from Level 2 to Level 3	6,200
Net gains (losses) on Level 3 liabilities (realized and unrealized)	46	(1,559)
Investments at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 3 to Level 2		24,200
Net gains (losses) on Level 3 assets (realized and unrealized)	$ 32,034	$ 76,257