Share-Based Payments (Schedule of Share Option Valuation Assumptions) (Details) - $ / shares	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value per share option (in usd per share)	$ 13.48	$ 15.22
Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	41.00%	40.00%
Risk-free interest rate	4.67%	3.85%
Expected share option life (in years)	6 years	6 years
Dividend yield	1.75%	1.51%