Business Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 31, 2024	Nov. 30, 2023
Business Acquisition [Line Items]
Cash and cash equivalents		$ 90,881
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations		124,306
Financial instruments owned, at fair value		53,028
Investments in and loans to related parties		6,644
Receivables:
Brokers, dealers and clearing organizations		113,750
Fees, interest and other		19,473
Property and equipment, net		143,288
Assets held for sale		578,820
Other assets		129,413
Total assets acquired		1,392,117
Financial instruments sold, net yet purchased, at fair value		31,293
Payables:
Brokers, dealers and clearing organizations		236
Customers payables		297,494
Short-term borrowings		7,137
Lease liabilities		32,348
Liabilities held for sale		303,447
Accrued expenses and other liabilities		194,319
Long-term debt		75,437
Total liabilities assumed		941,711
Net assets acquired		450,406
Noncontrolling interests		42,168
Asset Management
Receivables:
Goodwill	$ 143,000	132,514
Stratos
Business Acquisition [Line Items]
Cash and cash equivalents		83,006
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations		124,306
Financial instruments owned, at fair value		53,028
Investments in and loans to related parties		0
Receivables:
Brokers, dealers and clearing organizations		113,750
Fees, interest and other		4,745
Property and equipment, net		31,830
Assets held for sale		0
Other assets		31,135
Total assets acquired		447,263
Financial instruments sold, net yet purchased, at fair value		31,293
Payables:
Brokers, dealers and clearing organizations		236
Customers payables		297,494
Short-term borrowings		0
Lease liabilities		9,308
Liabilities held for sale		0
Accrued expenses and other liabilities		18,011
Long-term debt		0
Total liabilities assumed		356,342
Net assets acquired		90,921
Noncontrolling interests		0
Stratos | Asset Management
Receivables:
Goodwill		5,463
OpNet
Business Acquisition [Line Items]
Cash and cash equivalents		7,875
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations		0
Financial instruments owned, at fair value		0
Investments in and loans to related parties		6,644
Receivables:
Brokers, dealers and clearing organizations		0
Fees, interest and other		14,728
Property and equipment, net		111,458
Assets held for sale		578,820
Other assets		98,278
Total assets acquired		944,854
Financial instruments sold, net yet purchased, at fair value		0
Payables:
Brokers, dealers and clearing organizations		0
Customers payables		0
Short-term borrowings		7,137
Lease liabilities		23,040
Liabilities held for sale		303,447
Accrued expenses and other liabilities		176,308
Long-term debt		75,437
Total liabilities assumed		585,369
Net assets acquired		359,485
Noncontrolling interests		$ 42,168
Weighted Average Remaining Lives (Years)		20 years
OpNet | Asset Management
Receivables:
Goodwill		$ 127,051