Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2022
Assets
Cash and cash equivalents	$ 12,153,414	$ 8,526,363
Financial instruments owned, at fair value	24,138,274	21,747,473
Securities borrowed	7,213,421	7,192,091
Securities purchased under agreements to resell	6,179,653	5,950,549
Receivables:
Brokers, dealers and clearing organizations	2,666,591	2,380,732
Fees, interest and other	663,536	630,142
Other assets	3,072,302	2,650,640
Total assets	64,360,309	57,905,161
Liabilities
Financial instruments sold, not yet purchased, at fair value	11,007,328	11,251,154
Securities loaned	2,540,861	1,840,518
Securities sold under agreements to repurchase	12,337,935	10,920,606
Payables:
Brokers, dealers and clearing organizations	3,686,367	3,737,810
Accrued expenses and other liabilities	3,510,831	2,546,211
Long-term debt	13,530,565	9,698,752
Total liabilities	54,134,916	48,102,620
Revenues
Revenues	10,515,069	7,441,399	$ 7,149,263
Interest expense	3,480,266	2,740,982	1,170,425
Net revenues	7,034,803	4,700,417	5,978,838
Non-interest expenses
Business development	283,459	177,541	150,500
Total non-interest expenses	6,029,257	4,346,148	4,923,276
Principal transactions
Revenues
Revenues	1,816,963	1,413,283	833,757
Commissions and other fees
Revenues
Revenues	1,085,349	905,665	925,494
Interest
Revenues
Revenues	3,543,497	$ 2,868,674	$ 1,183,638
Sumitomo Mitsui Banking Corporation Agreement | Related Party
Assets
Cash and cash equivalents	542,212
Financial instruments owned, at fair value	1,539
Securities borrowed	20,403
Securities purchased under agreements to resell	381,568
Receivables:
Brokers, dealers and clearing organizations	3,012
Fees, interest and other	7,851
Other assets	175
Total assets	956,760
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,830
Securities loaned	187
Securities sold under agreements to repurchase	631,390
Payables:
Brokers, dealers and clearing organizations	18,701
Accrued expenses and other liabilities	6,767
Long-term debt	0
Total liabilities	658,875
Revenues
Revenues	14,167
Interest expense	13,238
Net revenues	929
Non-interest expenses
Business development	7,274
Total non-interest expenses	7,274
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Investment banking
Revenues
Revenues	5,066
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Principal transactions
Revenues
Revenues	(5,997)
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Commissions and other fees
Revenues
Revenues	895
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Interest
Revenues
Revenues	14,203
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Revolving Credit Facility | Line of credit
Payables:
Paydown on a credit facility	$ 350,000