Derivative Financial Instruments - Fair Value and Related Number of Derivative Contracts Categorized by Type of Derivative Contract (Details) $ in Thousands	Nov. 30, 2024 USD ($) Contract	Nov. 30, 2023 USD ($) Contract contract
Derivatives, Fair Value [Line Items]
Net amounts per consolidated statements of financial condition, assets	$ 517,775	$ 550,844
Net amounts per consolidated statements of financial condition, liabilities	$ 710,314	$ 1,145,777
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	$ 682,622	$ 678,917
Fair value, liabilities	521,919	393,316
Amounts offset in the consolidated statements of financial condition, assets	(476,364)	(384,392)
Amounts offset in the consolidated statements of financial condition, liabilities	(476,364)	(384,392)
Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	1,065,726	1,194,983
Fair value, liabilities	1,069,382	1,230,060
Amounts offset in the consolidated statements of financial condition, assets	(1,058,995)	(1,189,517)
Amounts offset in the consolidated statements of financial condition, liabilities	(1,066,232)	(1,189,513)
Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	1,437,178	1,784,564
Fair value, liabilities	1,912,726	2,286,973
Amounts offset in the consolidated statements of financial condition, assets	(1,132,392)	(1,533,711)
Amounts offset in the consolidated statements of financial condition, liabilities	(1,251,117)	(1,190,667)
Derivatives designated as accounting hedges:
Derivatives, Fair Value [Line Items]
Fair value, assets	45,299	259
Fair value, liabilities	0	25,708
Derivatives designated as accounting hedges: | Interest rate contracts: | Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 3,396	$ 0
Number of contracts, assets | Contract	3	0
Fair value, liabilities	$ 0	$ 6,070
Number of contracts, liabilities | Contract	0	3
Derivatives designated as accounting hedges: | Foreign exchange contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 41,903	$ 259
Number of contracts, assets | Contract	3	1
Fair value, liabilities	$ 0	$ 19,638
Number of contracts, liabilities | Contract	0	0
Derivatives not designated as accounting hedges:
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 3,140,227	$ 3,658,205
Fair value, liabilities	3,504,027	3,884,641
Derivatives not designated as accounting hedges: | Interest rate contracts: | Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 273	$ 316
Number of contracts, assets | Contract	16,548	88,354
Fair value, liabilities	$ 13	$ 63
Number of contracts, liabilities | Contract	32,984	67,643
Derivatives not designated as accounting hedges: | Interest rate contracts: | Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 1,030,842	$ 1,156,937
Number of contracts, assets | Contract	6,663	4,415
Fair value, liabilities	$ 1,030,671	$ 1,185,503
Number of contracts, liabilities | Contract	6,891	4,544
Derivatives not designated as accounting hedges: | Interest rate contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 365,678	$ 893,983
Number of contracts, assets | Contract	1,096	1,179
Fair value, liabilities	$ 717,255	$ 1,266,506
Number of contracts, liabilities | Contract	1,256	786
Derivatives not designated as accounting hedges: | Foreign exchange contracts: | Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets		$ 0
Number of contracts, assets | Contract		0
Fair value, liabilities		$ 0
Number of contracts, liabilities | Contract		4
Derivatives not designated as accounting hedges: | Foreign exchange contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 132,240	$ 147,470
Number of contracts, assets | Contract	57,786	66,254
Fair value, liabilities	$ 138,608	$ 129,770
Number of contracts, liabilities | Contract	35,545	38,585
Derivatives not designated as accounting hedges: | Equity contracts: | Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 682,327	$ 678,542
Number of contracts, assets | Contract	1,777,822	1,180,832
Fair value, liabilities	$ 521,889	$ 393,220
Number of contracts, liabilities | Contract	1,574,498	1,174,298
Derivatives not designated as accounting hedges: | Equity contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 855,169	$ 715,754
Number of contracts, assets | Contract	33,516	31,116
Fair value, liabilities	$ 1,024,129	$ 850,088
Number of contracts, liabilities | Contract	20,587	16,234
Derivatives not designated as accounting hedges: | Commodity contracts: | Exchange-traded
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 22	$ 59
Number of contracts, assets | Contract	806	735
Fair value, liabilities	$ 17	$ 33
Number of contracts, liabilities | Contract	697	940
Derivatives not designated as accounting hedges: | Commodity contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 4,570	$ 5,662
Number of contracts, assets	11,691	15,497
Fair value, liabilities	$ 1,381	$ 1,398
Number of contracts, liabilities	5,180	6,455
Derivatives not designated as accounting hedges: | Credit contracts: | Cleared OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 31,488	$ 38,046
Number of contracts, assets | Contract	66	133
Fair value, liabilities	$ 38,711	$ 38,487
Number of contracts, liabilities | Contract	32	81
Derivatives not designated as accounting hedges: | Credit contracts: | Bilateral OTC
Derivatives, Fair Value [Line Items]
Fair value, assets	$ 37,618	$ 21,436
Number of contracts, assets | Contract	16	22
Fair value, liabilities	$ 31,353	$ 19,573
Number of contracts, liabilities | Contract	32	29