Collateralized Transactions - Contractual Maturity (Details) - USD ($) $ in Thousands	Nov. 30, 2020	Nov. 30, 2019
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Lending Arrangements	$ 1,810,748	$ 1,525,140
Repurchase Agreements	15,159,273	18,756,917
Obligation To Return Securities Received As Collateral, at fair value	7,517	9,500
Total	16,977,538	20,291,557
Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Lending Arrangements	636,256	694,821
Repurchase Agreements	5,510,476	6,614,026
Obligation To Return Securities Received As Collateral, at fair value	7,517	0
Total	6,154,249	7,308,847
Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Lending Arrangements	59,735	0
Repurchase Agreements	1,747,526	1,556,260
Obligation To Return Securities Received As Collateral, at fair value	0	0
Total	1,807,261	1,556,260
31-90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Lending Arrangements	459,455	672,969
Repurchase Agreements	5,019,885	8,988,528
Obligation To Return Securities Received As Collateral, at fair value	0	9,500
Total	5,479,340	9,670,997
Greater Than 90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Lending Arrangements	655,302	157,350
Repurchase Agreements	2,881,386	1,598,103
Obligation To Return Securities Received As Collateral, at fair value	0	0
Total	$ 3,536,688	$ 1,755,453