Collateralized Transactions - Contractual Maturity (Details) $ in Thousands	Nov. 30, 2015 USD ($)
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	$ 2,979,300
Repurchase Agreements	20,195,982
Total	23,175,282
Overnight and Continuous [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	1,522,475
Repurchase Agreements	7,850,791
Total	9,373,266
Up to 30 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	0
Repurchase Agreements	5,218,059
Total	5,218,059
30-90 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	973,201
Repurchase Agreements	5,291,729
Total	6,264,930
Greater than 90 Days [Member]
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	483,624
Repurchase Agreements	1,835,403
Total	$ 2,319,027