Derivative Financial Instruments (Remaining Contract Maturity Of Fair Value Of OTC Derivative Assets And Liabilities) (Details) $ in Thousands	May 31, 2019 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	$ 194,673
OTC derivative assets having maturity period of 1 to 5 years	259,658
OTC derivative assets having maturity period of greater than 5 years	124,949
OTC derivative assets cross-maturity netting	(94,678)
Total OTC derivative assets, net of cross-maturity netting	484,602
Cross product counterparty netting	(39,313)
Total OTC derivative assets included in Trading assets	445,289
OTC derivative liabilities having maturity period of 0 to 12 months	234,523
OTC derivative liabilities having maturity period of 1 to 5 years	259,998
OTC derivative liabilities having maturity period of greater than 5 years	161,590
OTC derivative liabilities cross-maturity netting	(94,678)
Total OTC derivative liabilities, net of cross-maturity netting	561,433
Cross product counterparty netting	(39,313)
Total OTC derivative liabilities included in Trading liabilities	522,120
Exchange traded derivative assets and other credit agreements	28,300
Cash collateral received	117,100
Exchange traded derivative liabilities and other credit agreements	321,400
Cash collateral pledged	289,300
Commodity 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	15,034
OTC derivative assets having maturity period of 1 to 5 years	15,758
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(4,355)
Total OTC derivative assets, net of cross-maturity netting	26,437
OTC derivative liabilities having maturity period of 0 to 12 months	1,986
OTC derivative liabilities having maturity period of 1 to 5 years	2,369
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(4,355)
Total OTC derivative liabilities, net of cross-maturity netting	0
Equity 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	40,703
OTC derivative assets having maturity period of 1 to 5 years	26
OTC derivative assets having maturity period of greater than 5 years	4,031
OTC derivative assets cross-maturity netting	(2,233)
Total OTC derivative assets, net of cross-maturity netting	42,527
OTC derivative liabilities having maturity period of 0 to 12 months	28,465
OTC derivative liabilities having maturity period of 1 to 5 years	118,560
OTC derivative liabilities having maturity period of greater than 5 years	40,591
OTC derivative liabilities cross-maturity netting	(2,233)
Total OTC derivative liabilities, net of cross-maturity netting	185,383
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	807
OTC derivative assets having maturity period of 1 to 5 years	966
OTC derivative assets having maturity period of greater than 5 years	2,294
OTC derivative assets cross-maturity netting	(469)
Total OTC derivative assets, net of cross-maturity netting	3,598
OTC derivative liabilities having maturity period of 0 to 12 months	40
OTC derivative liabilities having maturity period of 1 to 5 years	2,535
OTC derivative liabilities having maturity period of greater than 5 years	3,583
OTC derivative liabilities cross-maturity netting	(469)
Total OTC derivative liabilities, net of cross-maturity netting	5,689
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	9,675
OTC derivative assets having maturity period of 1 to 5 years	51,481
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(1,607)
Total OTC derivative assets, net of cross-maturity netting	59,549
OTC derivative liabilities having maturity period of 0 to 12 months	89,603
OTC derivative liabilities having maturity period of 1 to 5 years	37,003
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(1,607)
Total OTC derivative liabilities, net of cross-maturity netting	124,999
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	53,115
OTC derivative assets having maturity period of 1 to 5 years	21,850
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(15,480)
Total OTC derivative assets, net of cross-maturity netting	59,485
OTC derivative liabilities having maturity period of 0 to 12 months	67,386
OTC derivative liabilities having maturity period of 1 to 5 years	18,225
OTC derivative liabilities having maturity period of greater than 5 years	1,404
OTC derivative liabilities cross-maturity netting	(15,480)
Total OTC derivative liabilities, net of cross-maturity netting	71,535
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	600
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	600
Interest rate 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	75,339
OTC derivative assets having maturity period of 1 to 5 years	169,577
OTC derivative assets having maturity period of greater than 5 years	118,624
OTC derivative assets cross-maturity netting	(70,534)
Total OTC derivative assets, net of cross-maturity netting	293,006
OTC derivative liabilities having maturity period of 0 to 12 months	46,443
OTC derivative liabilities having maturity period of 1 to 5 years	81,306
OTC derivative liabilities having maturity period of greater than 5 years	116,012
OTC derivative liabilities cross-maturity netting	(70,534)
Total OTC derivative liabilities, net of cross-maturity netting	$ 173,227