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Segment Analysis - Narrative (Details) market in Thousands | 9 Months Ended
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Jun. 30, 2025 employee market country currency
Segment Reporting Information [Line Items] |
Number of employees | employee | 4,700
Number of countries in which entity operates (more than) | 180
Self-Directed/Retail |
Segment Reporting Information [Line Items] |
Number of global financial markets (more than) | market | 18
Payments |
Segment Reporting Information [Line Items] |
Number of countries in which entity operates (more than) | 180
Number of different types of foreign currencies (more than) | currency | 140

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
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Namespace Prefix: | dei_
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Balance Type: | na
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X
- Definition Number of different types of foreign currencies the company trades + References No definition available. + Details
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Namespace Prefix: | intl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Global Financial Markets + References No definition available. + Details
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Namespace Prefix: | intl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
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Period Type: | instant

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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 No definition available. + Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |