Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) $ in Thousands	12 Months Ended
	Nov. 30, 2024 USD ($)	Nov. 30, 2023 USD ($)	Nov. 30, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, impairment loss	$ (10)	$ (78)
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses	Other expenses	Other expenses
Real Estate Property | Discount rate/yield
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, measurement input	0.120
Minimum | Equity Method Investments | Discount rate/yield
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investments, measurement input	0.100
Maximum | Equity Method Investments | Discount rate/yield
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investments, measurement input	0.230
Maximum | Real Estate Property | Discount rate/yield
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, measurement input	0.140
Exchange and clearing organization membership interests and registrations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, impairment loss	$ (10)	$ (78)
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in and loans to related parties, impairment loss		57,248	$ 27,119
Premises and equipment impairment	21,900	2,101	6,701
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in and loans to related parties, fair value		0	106,172
Other assets, fair value	21,900	1,755	1,709
Nonrecurring | Premises and equipment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, impairment loss	(1,323)
Nonrecurring | Premises and equipment | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, fair value	0
Nonrecurring | Exchange and clearing organization membership interests and registrations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, impairment loss	(10)	(78)	(39)
Nonrecurring | Exchange and clearing organization membership interests and registrations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, fair value	$ 0	$ 0	$ 0