Collateralized Transactions - Collateral Pledged (Details) - USD ($) $ in Thousands	May 31, 2019	Nov. 30, 2018
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	$ 2,327,805	$ 1,838,688
Repurchase Agreements	21,093,190	17,193,486
Total	23,420,995	19,032,174
Corporate equity securities
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	2,006,944	1,505,218
Repurchase Agreements	391,858	487,124
Total	2,398,802	1,992,342
Corporate debt securities
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	252,023	333,221
Repurchase Agreements	1,826,868	1,853,309
Total	2,078,891	2,186,530
Mortgage- and asset-backed securities
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	0	249
Repurchase Agreements	2,077,535	2,820,543
Total	2,077,535	2,820,792
U.S. government and federal agency securities
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	68,838	0
Repurchase Agreements	12,234,328	8,181,947
Total	12,303,166	8,181,947
Municipal securities
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	0	0
Repurchase Agreements	612,747	604,274
Total	612,747	604,274
Sovereign obligations
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	0	0
Repurchase Agreements	3,184,103	2,945,521
Total	3,184,103	2,945,521
Loans and other receivables
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	0	0
Repurchase Agreements	765,751	300,768
Total	$ 765,751	$ 300,768