Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2023	Sep. 30, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value (usd per share)	$ 0	$ 0
Preferred stock authorized (in shares)	40,000,000	40,000,000
Preferred stock issued (in shares)	0	0
Preferred stock outstanding (in shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	400,000,000.0	400,000,000.0
Common stock issued (in shares)	134,800,000	176,100,000
Common stock outstanding (in shares)	134,800,000	176,100,000