Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2023	Sep. 30, 2022
Statement of Financial Position [Abstract]
Preferred shares, par value (in usd per share)	$ 0.01	$ 0.01
Preferred shares, authorized (in shares)	10,000,000	10,000,000
Preferred shares, issued (in shares)	0	0
Preferred shares, outstanding (in shares)	0	0
Common shares, par value (in usd per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	300,000,000	300,000,000
Common shares, issued (in shares)	65,251,989	65,251,989
Common shares, outstanding (in shares)	51,215,845	51,573,001
Treasury Stock, Common, Shares	14,036,144	13,678,988