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Collateralized Transactions - Contractual Maturity (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Nov. 30, 2018
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 2,182,865 $ 1,838,688
Repurchase Agreements 21,323,082 17,193,486
Total 23,505,947 19,032,174
Overnight and Continuous    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 1,305,512 807,347
Repurchase Agreements 9,207,762 7,849,052
Total 10,513,274 8,656,399
Up to 30 Days    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 70,319 0
Repurchase Agreements 2,376,018 1,915,325
Total 2,446,337 1,915,325
31-90 Days    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 635,864 560,417
Repurchase Agreements 3,897,096 6,042,951
Total 4,532,960 6,603,368
Greater than 90 Days    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 171,170 470,924
Repurchase Agreements 5,842,206 1,386,158
Total $ 6,013,376 $ 1,857,082