Collateralized Transactions - Contractual Maturity (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Nov. 30, 2016
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	$ 2,763,253	$ 2,819,132
Repurchase Agreements	19,839,207	17,012,332
Total	22,602,460	19,831,464
Overnight and Continuous
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	1,490,137	2,131,891
Repurchase Agreements	12,556,923	9,147,176
Total	14,047,060	11,279,067
Up to 30 Days
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	0	39,673
Repurchase Agreements	3,187,276	2,008,119
Total	3,187,276	2,047,792
31-90 Days
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	783,633	104,516
Repurchase Agreements	3,051,449	3,809,533
Total	3,835,082	3,914,049
Greater than 90 Days
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	489,483	543,052
Repurchase Agreements	1,043,559	2,047,504
Total	$ 1,533,042	$ 2,590,556