Derivative Financial Instruments - Fair Value and Related Number of Derivative Contracts Categorized by Type of Derivative Contract (Details) $ in Thousands	Feb. 28, 2025 USD ($) Contract	Nov. 30, 2024 USD ($) Contract
Derivatives, Fair Value [Line Items]
Net amounts per consolidated statements of financial condition, assets	$ 658,668	$ 517,775
Net amounts per consolidated statements of financial condition, liabilities	$ 678,464	$ 710,314
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Financial instruments owned	Financial instruments owned
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Financial instruments sold, not yet purchased, at fair value	Financial instruments sold, not yet purchased, at fair value
Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 843,070	$ 682,622
Fair value, liabilities	731,569	521,919
Amounts offset in the consolidated statements of financial condition, assets	(617,442)	(476,364)
Amounts offset in the consolidated statements of financial condition, liabilities	(617,442)	(476,364)
Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	1,838,971	1,065,726
Fair value, liabilities	1,866,083	1,069,382
Amounts offset in the consolidated statements of financial condition, assets	(1,836,758)	(1,058,995)
Amounts offset in the consolidated statements of financial condition, liabilities	(1,848,671)	(1,066,232)
Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	1,593,953	1,437,178
Fair value, liabilities	1,658,189	1,912,726
Amounts offset in the consolidated statements of financial condition, assets	(1,163,126)	(1,132,392)
Amounts offset in the consolidated statements of financial condition, liabilities	(1,111,264)	(1,251,117)
Derivatives designated as accounting hedges:
Derivatives, Fair Value [Line Items]
Fair value, assets	63,712	45,299
Fair value, liabilities	0	0
Derivatives designated as accounting hedges: | Interest rate contracts: | Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 4,897	$ 3,396
Number of contracts, assets | Contract	3	3
Fair value, liabilities	$ 0	$ 0
Number of contracts, liabilities | Contract	0	0
Derivatives designated as accounting hedges: | Foreign exchange contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 58,815	$ 41,903
Number of contracts, assets | Contract	3	3
Fair value, liabilities	$ 0	$ 0
Number of contracts, liabilities | Contract	0	0
Derivatives not designated as accounting hedges:
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 4,212,282	$ 3,140,227
Fair value, liabilities	4,255,841	3,504,027
Derivatives not designated as accounting hedges: | Interest rate contracts: | Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 263	$ 273
Number of contracts, assets | Contract	45,486	16,548
Fair value, liabilities	$ 0	$ 13
Number of contracts, liabilities | Contract	22,552	32,984
Derivatives not designated as accounting hedges: | Interest rate contracts: | Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 1,790,994	$ 1,030,842
Number of contracts, assets | Contract	7,264	6,663
Fair value, liabilities	$ 1,823,494	$ 1,030,671
Number of contracts, liabilities | Contract	7,679	6,891
Derivatives not designated as accounting hedges: | Interest rate contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 350,898	$ 365,678
Number of contracts, assets | Contract	1,518	1,096
Fair value, liabilities	$ 667,793	$ 717,255
Number of contracts, liabilities | Contract	991	1,256
Derivatives not designated as accounting hedges: | Foreign exchange contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 101,760	$ 132,240
Number of contracts, assets | Contract	42,295	57,786
Fair value, liabilities	$ 119,188	$ 138,608
Number of contracts, liabilities | Contract	12,740	35,545
Derivatives not designated as accounting hedges: | Equity contracts: | Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 842,797	$ 682,327
Number of contracts, assets | Contract	2,002,426	1,777,822
Fair value, liabilities	$ 731,454	$ 521,889
Number of contracts, liabilities | Contract	1,764,359	1,574,498
Derivatives not designated as accounting hedges: | Equity contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 1,025,374	$ 855,169
Number of contracts, assets | Contract	29,093	33,516
Fair value, liabilities	$ 838,819	$ 1,024,129
Number of contracts, liabilities | Contract	23,043	20,587
Derivatives not designated as accounting hedges: | Commodity contracts: | Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 10	$ 22
Number of contracts, assets | Contract	602	806
Fair value, liabilities	$ 115	$ 17
Number of contracts, liabilities | Contract	568	697
Derivatives not designated as accounting hedges: | Commodity contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 4,519	$ 4,570
Number of contracts, assets | Contract	11,289	11,691
Fair value, liabilities	$ 1,509	$ 1,381
Number of contracts, liabilities | Contract	5,148	5,180
Derivatives not designated as accounting hedges: | Credit contracts: | Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 43,080	$ 31,488
Number of contracts, assets | Contract	106	66
Fair value, liabilities	$ 42,589	$ 38,711
Number of contracts, liabilities | Contract	72	32
Derivatives not designated as accounting hedges: | Credit contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 52,587	$ 37,618
Number of contracts, assets | Contract	17	16
Fair value, liabilities	$ 30,880	$ 31,353
Number of contracts, liabilities | Contract	24	32