Share-Based Payments (Schedule of Share Option Valuation Assumptions) (Details) - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value per share option (in usd per share)	$ 15.22	$ 14.25
Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	40.00%	39.00%
Risk-free interest rate	3.85%	1.33%
Expected share option life (in years)	6 years	6 years 1 month 6 days
Dividend yield	1.51%	1.42%