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Total Equity - Accumulated Other Comprehensive Income (Loss) Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 29, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Revenues $ 2,871,265 $ 2,472,864  
Compensation and benefits (1,085,890) (841,127)  
Net earnings 159,346 136,849  
Income tax (benefit) expense (52,870) (14,216)  
Principal transactions      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Revenues 487,498 407,230  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net earnings 3,152 1,779  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net unrealized gains on instrument-specific credit risk at fair value      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax (benefit) expense (1,100)   $ (900)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net unrealized gains on instrument-specific credit risk at fair value | Principal transactions      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Revenues 3,307 2,538  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Amortization of defined benefit pension plan actuarial losses      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Compensation and benefits $ (155) (759)  
Income tax (benefit) expense   $ 200