Collateralized Transactions - Contractual Maturity (Details) - USD ($) $ in Thousands	May 31, 2017	Nov. 30, 2016
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	$ 3,446,853	$ 2,819,132
Repurchase Agreements	17,317,332	17,012,332
Total	20,764,185	19,831,464
Overnight and Continuous [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	2,247,140	2,131,891
Repurchase Agreements	9,215,374	9,147,176
Total	11,462,514	11,279,067
Up to 30 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	37,112	39,673
Repurchase Agreements	3,994,002	2,008,119
Total	4,031,114	2,047,792
30-90 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	693,014	104,516
Repurchase Agreements	2,666,364	3,809,533
Total	3,359,378	3,914,049
Greater than 90 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	469,587	543,052
Repurchase Agreements	1,441,592	2,047,504
Total	$ 1,911,179	$ 2,590,556