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Collateralized Transactions - Contractual Maturity (Details) - USD ($)
$ in Thousands
Feb. 28, 2019
Nov. 30, 2018
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 2,234,700 $ 1,838,688
Repurchase Agreements 21,662,963 17,193,486
Total 23,897,663 19,032,174
Overnight and Continuous    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 1,034,306 807,347
Repurchase Agreements 11,379,518 7,849,052
Total 12,413,824 8,656,399
Up to 30 Days    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 0 0
Repurchase Agreements 4,169,261 1,915,325
Total 4,169,261 1,915,325
31-90 Days    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 1,002,932 560,417
Repurchase Agreements 4,223,211 6,042,951
Total 5,226,143 6,603,368
Greater than 90 Days    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 197,462 470,924
Repurchase Agreements 1,890,973 1,386,158
Total $ 2,088,435 $ 1,857,082