Variable Interest Entities - Assets and Liabilities of Consolidated VIEs Prior to Consolidation (Details) - USD ($) $ in Thousands	Feb. 28, 2025	Nov. 30, 2024
Variable Interest Entity [Line Items]
Financial instruments owned	$ 26,087,291	$ 24,138,274
Securities purchased under agreements to resell	8,125,231	6,179,653
Receivables from brokers	3,534,080	2,666,591
Other assets	3,294,571	3,072,302
Total assets	70,218,891	64,360,309
Financial instruments sold, not yet purchased	13,997,227	11,007,328
Other secured financings	2,280,003	2,183,000
Long-term debt	14,785,553	13,530,565
Total liabilities	59,950,046	54,134,916
VIEs, Primary Beneficiary
Variable Interest Entity [Line Items]
Other assets	472,953	429,347
VIEs, Primary Beneficiary | Secured Funding Vehicles
Variable Interest Entity [Line Items]
Cash	0	0
Financial instruments owned	0	0
Securities purchased under agreements to resell	2,964,000	2,829,700
Receivables from brokers	0	0
Other receivables	0	0
Other assets	0	0
Total assets	2,964,000	2,829,700
Financial instruments sold, not yet purchased	0	0
Other secured financings	2,958,800	2,823,000
Other Liabilities	5,200	6,700
Long-term debt	0	0
Total liabilities	2,964,000	2,829,700
VIEs, Primary Beneficiary | Other
Variable Interest Entity [Line Items]
Cash	2,000	1,600
Financial instruments owned	43,400	40,000
Securities purchased under agreements to resell	0	0
Receivables from brokers	18,900	23,500
Other receivables	3,000	3,000
Other assets	89,300	90,300
Total assets	156,600	158,400
Financial instruments sold, not yet purchased	9,000	7,600
Other secured financings	22,800	26,100
Other Liabilities	23,400	23,100
Long-term debt	70,100	70,100
Total liabilities	125,300	126,900
Consolidation, Eliminations
Variable Interest Entity [Line Items]
Receivables from brokers	1,000	1,500
Variable Interest Entity, Assets, Eliminated In Consolidation
Variable Interest Entity [Line Items]
Other assets	3,500	3,400
Variable Interest Entity, Liabilities, Eliminated In Consolidation
Variable Interest Entity [Line Items]
Other secured financings	855,400	719,000
Other Liabilities	$ 22,000	$ 22,000