Segment Analysis - Narrative (Details)	6 Months Ended
	Mar. 31, 2022 employee country currency market
Segment Reporting Information [Line Items]
Number of employees | employee	3,300
Number of countries in which entity operates	180
Retail Segment
Segment Reporting Information [Line Items]
Number of countries in which entity operates	180
Number of global financial markets | market	18,000
Global Payments
Segment Reporting Information [Line Items]
Number of countries in which entity operates	185
Number of different types of foreign currencies | currency	140