Derivative Financial Instruments - Remaining Contract Maturity of Fair Value of OTC Derivative Assets and Liabilities (Details) $ in Thousands	Feb. 28, 2025 USD ($)
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	$ 605,313
1 – 5 Years	457,739
Greater Than 5 Years	32,368
Cross-Maturity Netting	(34,774)
Total OTC derivative assets, net of cross-maturity netting	1,060,646
Cross-product counterparty netting	(36,026)
Total OTC derivative assets included in Financial instruments owned	1,024,620
0 – 12 Months	443,940
1 – 5 Years	288,731
Greater Than 5 Years	454,107
Cross-Maturity Netting	(34,774)
Total OTC derivative liabilities, net of cross-maturity netting	1,152,004
Cross-product counterparty netting	(36,026)
Total OTC derivative liabilities included in Financial instruments sold, not yet purchased	1,115,978
Exchange traded derivative assets, with fair value	225,600
Exchange traded derivative liabilities, with fair value	114,100
Cash collateral received	591,600
Cash collateral pledged	551,600
Commodity swaps, options and forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	4,514
1 – 5 Years	0
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative assets, net of cross-maturity netting	4,514
0 – 12 Months	1,504
1 – 5 Years	0
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative liabilities, net of cross-maturity netting	1,504
Equity options and forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	237,386
1 – 5 Years	216,424
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative assets, net of cross-maturity netting	453,810
0 – 12 Months	123,339
1 – 5 Years	85,742
Greater Than 5 Years	13,442
Cross-Maturity Netting	0
Total OTC derivative liabilities, net of cross-maturity netting	222,523
Credit default swaps
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	0
1 – 5 Years	27,055
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative assets, net of cross-maturity netting	27,055
0 – 12 Months	1,049
1 – 5 Years	3,748
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative liabilities, net of cross-maturity netting	4,797
Total return swaps
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	150,024
1 – 5 Years	54,555
Greater Than 5 Years	231
Cross-Maturity Netting	(3,816)
Total OTC derivative assets, net of cross-maturity netting	200,994
0 – 12 Months	181,051
1 – 5 Years	93,519
Greater Than 5 Years	0
Cross-Maturity Netting	(3,816)
Total OTC derivative liabilities, net of cross-maturity netting	270,754
Foreign currency forwards, swaps and options
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	119,656
1 – 5 Years	2,013
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative assets, net of cross-maturity netting	121,669
0 – 12 Months	78,859
1 – 5 Years	1,425
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative liabilities, net of cross-maturity netting	80,284
Fixed income forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	25,679
1 – 5 Years	0
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative assets, net of cross-maturity netting	25,679
0 – 12 Months	718
1 – 5 Years	0
Greater Than 5 Years	0
Cross-Maturity Netting	0
Total OTC derivative liabilities, net of cross-maturity netting	718
Interest rate swaps, options and forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
0 – 12  Months	68,054
1 – 5 Years	157,692
Greater Than 5 Years	32,137
Cross-Maturity Netting	(30,958)
Total OTC derivative assets, net of cross-maturity netting	226,925
0 – 12 Months	57,420
1 – 5 Years	104,297
Greater Than 5 Years	440,665
Cross-Maturity Netting	(30,958)
Total OTC derivative liabilities, net of cross-maturity netting	$ 571,424