Summary of Significant Accounting Policies - Shares used in Computing Basic and Diluted Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accounting Policies [Abstract]
Weighted-average common shares outstanding for basic computation (in shares)	211,309	209,806	209,940
Incremental shares issuable for stock options, common stock awards and Equity Units (in shares)	3,962	0	5,881
Weighted-average common shares outstanding for diluted computation (in shares)	215,271	209,806	215,821
Antidilutive securities excluded from computation of earnings per share (in shares)	8,619	6,132	8,138