Collateralized Transactions - Repurchase Agreements and Securities Borrowing and Lending Arrangements (Details) - USD ($) $ in Thousands	Feb. 28, 2025	Nov. 30, 2024
Securities borrowing arrangements
Gross Amounts	$ 8,402,200	$ 7,213,400
Netting in Consolidated Statements of Financial Condition	0	0
Net Amounts in Consolidated Statements of Financial Condition	8,402,198	7,213,421
Additional amounts available for setoff	(435,300)	(325,400)
Available collateral	(1,804,900)	(1,537,300)
Net amount	6,162,000	5,350,700
Reverse repurchase agreements
Gross Amounts	15,146,300	11,930,700
Netting in Consolidated Statements of Financial Condition	(7,021,100)	(5,751,000)
Net Amounts in Consolidated Statements of Financial Condition	8,125,231	6,179,653
Additional amounts available for setoff	(1,607,000)	(1,475,900)
Available collateral	(6,418,100)	(4,574,000)
Net amount	100,100	129,800
Securities lending arrangements
Gross Amounts	2,501,600	2,540,900
Netting in Consolidated Statements of Financial Condition	0	0
Net Amounts in Consolidated Statements of Financial Condition	2,501,643	2,540,861
Additional amounts available for setoff	(435,300)	(325,400)
Available collateral	(1,999,000)	(2,091,400)
Net amount	67,300	124,100
Repurchase agreements
Gross Amounts	20,685,400	18,088,900
Netting in Consolidated Statements of Financial Condition	(7,021,100)	(5,751,000)
Net Amounts in Consolidated Statements of Financial Condition	13,664,290	12,337,935
Additional amounts available for setoff	(1,607,000)	(1,475,900)
Available collateral	(11,182,200)	(10,274,600)
Net amount	875,100	587,400
Securities borrowing arrangements	6,100,000	5,310,000
Securities borrowing arrangements, collateral	5,940,000	5,190,000
Repurchase agreements	815,000	645,000
Repurchase agreements, pledged securities collateral	831,500	656,900
Obligation to return securities received as collateral, at fair value
Securities lending arrangements
Gross Amounts	287,100	185,600
Netting in Consolidated Statements of Financial Condition	0	0
Net Amounts in Consolidated Statements of Financial Condition	287,100	185,600
Additional amounts available for setoff	0	0
Available collateral	(287,100)	(185,600)
Net amount	0	0
Securities received as collateral, at fair value
Securities borrowing arrangements
Gross Amounts	287,100	185,600
Netting in Consolidated Statements of Financial Condition	0	0
Net Amounts in Consolidated Statements of Financial Condition	287,100	185,600
Additional amounts available for setoff	0	0
Available collateral	(287,100)	(185,600)
Net amount	$ 0	$ 0