Collateralized Transactions - Contractual Maturity (Details) - USD ($) $ in Thousands	Feb. 28, 2018	Nov. 30, 2017
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	$ 2,372,473	$ 2,843,911
Repurchase Agreements	16,755,127	19,829,249
Obligation To Return Securities Received As Collateral		103
Total	19,127,600	22,673,263
Overnight and Continuous
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	1,115,462	1,676,940
Repurchase Agreements	8,192,755	10,780,474
Obligation To Return Securities Received As Collateral		103
Total	9,308,217	12,457,517
Up to 30 Days
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	0	0
Repurchase Agreements	2,606,412	4,058,228
Obligation To Return Securities Received As Collateral		0
Total	2,606,412	4,058,228
31-90 Days
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	869,585	741,971
Repurchase Agreements	4,815,819	3,211,464
Obligation To Return Securities Received As Collateral		0
Total	5,685,404	3,953,435
Greater than 90 Days
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]
Securities Lending Arrangements	387,426	425,000
Repurchase Agreements	1,140,141	1,779,083
Obligation To Return Securities Received As Collateral		0
Total	$ 1,527,567	$ 2,204,083