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Credit Facilities - Schedule of Debt (Details) - USD ($)
12 Months Ended
Sep. 30, 2024
Oct. 31, 2024
Oct. 30, 2024
Oct. 29, 2024
Oct. 28, 2024
Jun. 17, 2024
Mar. 01, 2024
Sep. 30, 2023
Line of Credit Facility [Line Items]                
Lenders under loans $ 338,800,000             $ 341,000,000.0
Uncommitted Credit Facilities 104,900,000             55,500,000
Notes payable to bank 6,900,000             7,500,000
Total outstanding borrowings $ 881,900,000             683,100,000
Notes payable to bank                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (as a percent) 2.35%              
Senior Secured Notes due 2031                
Line of Credit Facility [Line Items]                
Senior notes $ 543,100,000             0
Senior Secured Notes due 2031 | Senior notes                
Line of Credit Facility [Line Items]                
Stated interest rate (as a percent) 7.875%           7.875%  
Debt instrument, unamortized discount (premium) and debt issuance costs, net $ 6,900,000              
Senior Secured Notes due 2025                
Line of Credit Facility [Line Items]                
Senior notes $ 0             342,100,000
Senior Secured Notes due 2025 | Senior notes                
Line of Credit Facility [Line Items]                
Stated interest rate (as a percent) 8.625%         8.625%    
Debt instrument, unamortized discount (premium) and debt issuance costs, net               5,800,000
Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Line of credit facility borrowing $ 1,205,000,000              
Lenders under loans 227,000,000.0             278,000,000.0
Revolving Credit Facility | Senior StoneX Group Inc. Committed Credit Facility                
Line of Credit Facility [Line Items]                
Line of credit facility borrowing 500,000,000.0              
Lenders under loans $ 161,000,000.0             150,000,000.0
Revolving Credit Facility | Senior StoneX Group Inc. Committed Credit Facility | Base Rate                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (as a percent) 9.00%              
Revolving Credit Facility | Senior StoneX Group Inc. Committed Credit Facility | SOFR                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (as a percent) 6.95%              
Revolving Credit Facility | StoneX Financial Inc.                
Line of Credit Facility [Line Items]                
Stated interest rate (as a percent) 10.00%              
Line of credit facility borrowing $ 250,000,000.0              
Lenders under loans 0             0
Revolving Credit Facility | StoneX Commodity Solutions LLC                
Line of Credit Facility [Line Items]                
Line of credit facility borrowing 325,000,000.0              
Lenders under loans $ 66,000,000.0             103,000,000.0
Revolving Credit Facility | StoneX Commodity Solutions LLC | Subsequent Event                
Line of Credit Facility [Line Items]                
Line of credit facility borrowing       $ 250,000,000 $ 190,000,000      
Revolving Credit Facility | StoneX Commodity Solutions LLC | Base Rate                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (as a percent) 8.50%              
Revolving Credit Facility | StoneX Commodity Solutions LLC | SOFR                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (as a percent) 7.54%              
Revolving Credit Facility | StoneX Financial Ltd                
Line of Credit Facility [Line Items]                
Stated interest rate (as a percent) 7.47%              
Line of credit facility borrowing $ 115,000,000.0              
Lenders under loans $ 0             25,000,000.0
Revolving Credit Facility | StoneX Financial Ltd | Subsequent Event                
Line of Credit Facility [Line Items]                
Line of credit facility borrowing   $ 115,000,000 $ 100,000,000          
Revolving Credit Facility | StoneX Financial Pte. Ltd.                
Line of Credit Facility [Line Items]                
Stated interest rate (as a percent) 7.46%              
Line of credit facility borrowing $ 15,000,000.0              
Lenders under loans $ 0             $ 0