Derivative Financial Instruments - Remaining Contract Maturity of Fair Value of OTC Derivative Assets and Liabilities (Details) $ in Thousands	Nov. 30, 2020 USD ($)
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	$ 316,358
OTC derivative assets having maturity period of 1 to 5 years	213,701
OTC derivative assets having maturity period of greater than 5 years	222,966
OTC derivative assets cross-maturity netting	(73,537)
Total OTC derivative assets, net of cross-maturity netting	679,488
Cross product counterparty netting	(24,723)
Total OTC derivative assets included in Financial instruments owned	654,765
OTC derivative liabilities having maturity period of 0 to 12 months	224,128
OTC derivative liabilities having maturity period of 1 to 5 years	762,117
OTC derivative liabilities having maturity period of greater than 5 years	189,877
OTC derivative liabilities cross-maturity netting	(73,537)
Total OTC derivative liabilities, net of cross-maturity netting	1,102,585
Cross product counterparty netting	(24,723)
Total OTC derivative liabilities included in Financial instruments sold, not yet purchased	1,077,862
Exchange traded derivative assets	29,800
Cash collateral received	216,800
Exchange traded derivative liabilities, with fair value	22,500
Cash collateral pledged	459,300
Equity options and forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	32,766
OTC derivative assets having maturity period of 1 to 5 years	951
OTC derivative assets having maturity period of greater than 5 years	16,650
OTC derivative assets cross-maturity netting	(24,685)
Total OTC derivative assets, net of cross-maturity netting	25,682
OTC derivative liabilities having maturity period of 0 to 12 months	23,278
OTC derivative liabilities having maturity period of 1 to 5 years	491,595
OTC derivative liabilities having maturity period of greater than 5 years	119,988
OTC derivative liabilities cross-maturity netting	(24,685)
Total OTC derivative liabilities, net of cross-maturity netting	610,176
Credit default swaps
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	0
OTC derivative assets having maturity period of 1 to 5 years	750
OTC derivative assets having maturity period of greater than 5 years	11
OTC derivative assets cross-maturity netting	0
Total OTC derivative assets, net of cross-maturity netting	761
OTC derivative liabilities having maturity period of 0 to 12 months	0
OTC derivative liabilities having maturity period of 1 to 5 years	596
OTC derivative liabilities having maturity period of greater than 5 years	1,615
OTC derivative liabilities cross-maturity netting	0
Total OTC derivative liabilities, net of cross-maturity netting	2,211
Total return swaps
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	140,394
OTC derivative assets having maturity period of 1 to 5 years	25,110
OTC derivative assets having maturity period of greater than 5 years	1,321
OTC derivative assets cross-maturity netting	(2,975)
Total OTC derivative assets, net of cross-maturity netting	163,850
OTC derivative liabilities having maturity period of 0 to 12 months	88,130
OTC derivative liabilities having maturity period of 1 to 5 years	190,616
OTC derivative liabilities having maturity period of greater than 5 years	22
OTC derivative liabilities cross-maturity netting	(2,975)
Total OTC derivative liabilities, net of cross-maturity netting	275,793
Foreign currency forwards, swaps and options
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	62,249
OTC derivative assets having maturity period of 1 to 5 years	18,460
OTC derivative assets having maturity period of greater than 5 years	517
OTC derivative assets cross-maturity netting	(5,746)
Total OTC derivative assets, net of cross-maturity netting	75,480
OTC derivative liabilities having maturity period of 0 to 12 months	50,949
OTC derivative liabilities having maturity period of 1 to 5 years	13,376
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(5,746)
Total OTC derivative liabilities, net of cross-maturity netting	58,579
Fixed income forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative liabilities having maturity period of 0 to 12 months	213
OTC derivative liabilities having maturity period of 1 to 5 years	0
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	0
Total OTC derivative liabilities, net of cross-maturity netting	213
Interest rate swaps, options and forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	80,949
OTC derivative assets having maturity period of 1 to 5 years	168,430
OTC derivative assets having maturity period of greater than 5 years	204,467
OTC derivative assets cross-maturity netting	(40,131)
Total OTC derivative assets, net of cross-maturity netting	413,715
OTC derivative liabilities having maturity period of 0 to 12 months	61,558
OTC derivative liabilities having maturity period of 1 to 5 years	65,934
OTC derivative liabilities having maturity period of greater than 5 years	68,252
OTC derivative liabilities cross-maturity netting	(40,131)
Total OTC derivative liabilities, net of cross-maturity netting	$ 155,613