Revenues from Contracts with Customers (Schedule of Components of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2020	Feb. 28, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 912,816	$ 570,000
Revenue from other sources	779,448	625,012
Total revenues	1,692,264	1,195,012
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	179,430	154,950
Total revenues	179,430	154,950
Investment banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	592,002	285,596
Total revenues	592,002	285,596
Manufacturing revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	77,607	75,425
Total revenues	77,607	75,425
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	63,777	54,029
Principal transactions
Disaggregation of Revenue [Line Items]
Revenue from other sources	404,864	246,182
Total revenues	404,864	246,182
Interest income
Disaggregation of Revenue [Line Items]
Revenue from other sources	326,366	386,844
Total revenues	326,366	386,844
Other
Disaggregation of Revenue [Line Items]
Revenue from other sources	$ 48,218	$ (8,014)