Business Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) $ in Thousands	Nov. 30, 2023 USD ($)
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	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