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Segment and Geographic Information - Narrative (Details)
market in Thousands
 12 Months Ended
Sep. 30, 2025
employee
market
currency
country
Segment Reporting Information [Line Items]  
Number of employees (more than) | employee 5,400
Number of countries in which entity operates (more than) 180
Self-Directed/Retail  
Segment Reporting Information [Line Items]  
Number of countries in which entity operates (more than) 180
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