Summary of Significant Accounting Policies - Shares Used in Computing Basic and Diluted Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Denominator (thousands of shares):
Weighted-average common shares outstanding - basic (in shares)	209,782	209,934
Incremental shares issuable for stock options, common stock awards and Equity Units (in shares)	5,788	0
Weighted-average common shares outstanding - diluted (in shares)	215,570	209,934
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		6,431
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	8,285	6,625