Segment Analysis - Narrative (Details)	3 Months Ended
	Dec. 31, 2021 employee currency country 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