Net Income (Loss) Per Share - Anti-dilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Employee and Directors Stock Options
Antidilutive securities
Number of shares excluded as their effect would be anti-dilutive	184,868	218,787	210,666	254,133
Restricted Stock
Antidilutive securities
Number of shares excluded as their effect would be anti-dilutive	42,022	51,830	43,018	56,536
Deferred Restricted Stock
Antidilutive securities
Number of shares excluded as their effect would be anti-dilutive	5,403	2,976	6,268	3,427
Performance Shares
Antidilutive securities
Number of shares excluded as their effect would be anti-dilutive	38,650	47,896	41,106	51,466