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Regulatory Requirements and Subsidiary Dividend Restrictions - Narrative (Details)
 12 Months Ended
Sep. 30, 2024
USD ($)
Capital and Other Regulatory Requirements [Line Items]  
Adjusted net capital $ 10,000,000
StoneX Financial Inc.  
Capital and Other Regulatory Requirements [Line Items]  
Adjusted net capital $ 1,500,000
Adjusted net capital of percentage (as a percent) 8.00%
Broker-dealer, minimum net capital required, dividend withdrawal threshold, percent (as a percent) 120.00%
Net capital under commodity exchange act computation $ 435,700,000
Required net capital under commodity exchange act 243,500,000
GAIN Capital Group, LLC  
Capital and Other Regulatory Requirements [Line Items]  
Net capital under commodity exchange act computation 57,100,000
Required net capital under commodity exchange act 29,700,000
GAIN Capital Group, LLC | Customer and Non-Customer Risk Maintenance Margin  
Capital and Other Regulatory Requirements [Line Items]  
Adjusted net capital $ 1,000,000
Adjusted net capital of percentage (as a percent) 8.00%
GAIN Capital Group, LLC | Retail Customer Liabilities  
Capital and Other Regulatory Requirements [Line Items]  
Net capital under commodity exchange act computation $ 20,000,000
Percentage of net capital under commodity exchange act computation (as a percent) 5.00%
GAIN Capital Group, LLC | Liabilities Owed to Counterparties  
Capital and Other Regulatory Requirements [Line Items]  
Required net capital under commodity exchange act $ 10,000,000
Percentage of required net capital under commodity exchange act (as a percent) 10.00%
StoneX Markets LLC  
Capital and Other Regulatory Requirements [Line Items]  
Net capital under commodity exchange act computation $ 237,900,000
Required net capital under commodity exchange act 134,300,000
Minimum regulatory capital requirement $ 20,000,000