Stock-Based Compensation - Valuation Assumptions (Details)	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.21%	4.04%
Expected volatility of the Company’s stock	27.20%	33.50%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.86%	3.59%
Expected volatility of the Company’s stock	29.80%	29.40%
Expected life of option (years)	5 years 8 months 12 days	5 years 9 months 18 days
Expected dividend yield on the Company’s stock	2.77%	2.10%