Collateralized Transactions - Contractual Maturity (Details) - USD ($) $ in Thousands	Nov. 30, 2016	Nov. 30, 2015
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	$ 2,819,132	$ 2,979,300
Repurchase Agreements	17,012,332	20,195,982
Total	19,831,464	23,175,282
Overnight and Continuous [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	2,131,891	1,522,475
Repurchase Agreements	9,147,176	7,850,791
Total	11,279,067	9,373,266
Up to 30 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	39,673	0
Repurchase Agreements	2,008,119	5,218,059
Total	2,047,792	5,218,059
30-90 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	104,516	973,201
Repurchase Agreements	3,809,533	5,291,729
Total	3,914,049	6,264,930
Greater than 90 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	543,052	483,624
Repurchase Agreements	2,047,504	1,835,403
Total	$ 2,590,556	$ 2,319,027