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Credit Facilities - Credit Facilities and Financing Bridge Commitment (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) lender | Sep. 30, 2022 USD ($)
Line of Credit Facility [Line Items] |  |
Uncommitted Credit Facilities | $ 55,500,000 | $ 0
Notes payable to bank | 7,500,000 | 8,100,000
Senior Secured Notes | 342,100,000 | 339,100,000
Lenders under loans | $ 683,100,000 | 824,200,000
Notes payable to bank |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, basis spread on variable rate | 2.35% |
Senior Secured Notes |  |
Line of Credit Facility [Line Items] |  |
Interest rate percentage | 8.625% |
Debt instrument, unamortized discount (premium) and debt issuance costs, net | $ 5,800,000 |
Senior StoneX Group Inc. Committed Credit Facility | Secured Debt |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility borrowing | $ 42,500,000 |
Debt instrument, number of lenders | lender | 1 |
Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity under credit facilities | $ 1,200,000,000 |
Amount outstanding | 278,000,000.0 | 477,000,000.0
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 |
Long-term line of credit, noncurrent | $ 150,000,000.0 | 260,000,000.0
Revolving Credit Facility | Senior StoneX Group Inc. Committed Credit Facility | Base Rate |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, basis spread on variable rate | 9.50% |
Revolving Credit Facility | Senior StoneX Group Inc. Committed Credit Facility | SOFR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, basis spread on variable rate | 7.42% |
Revolving Credit Facility | StoneX Financial Inc. |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility borrowing | $ 190,000,000.0 |
Line of credit facility | $ 0 | 0
Interest rate percentage | 8.00% |
Revolving Credit Facility | StoneX Commodity Solutions LLC |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility borrowing | $ 400,000,000.0 |
Line of credit facility | $ 103,000,000.0 | 217,000,000.0
Revolving Credit Facility | StoneX Commodity Solutions LLC | Base Rate |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, basis spread on variable rate | 8.50% |
Revolving Credit Facility | StoneX Commodity Solutions LLC | SOFR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, basis spread on variable rate | 7.69% |
Revolving Credit Facility | StoneX Financial Ltd. |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility borrowing | $ 100,000,000.0 |
Line of credit facility | $ 25,000,000.0 | 0
Interest rate percentage | 7.81% |
Revolving Credit Facility | StoneX Financial Pte. Ltd. |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility borrowing | $ 10,000,000.0 |
Line of credit facility | $ 0 | $ 0
Interest rate percentage | 7.81% |

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- Definition Amount Outstanding on Committed Credit Facilities + References No definition available. + Details
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- Definition Debt Instrument, Number of Lenders + References No definition available. + Details
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- Definition Lines Of Credit Uncommitted Facilities + References No definition available. + Details
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- Definition Maximum Borrowing Capacity Under Credit Facilities + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481573/470-10-45-13 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481573/470-10-45-14 + Details
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- Definition Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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