Stock Award Plans - Nonvested Stock Options (Details) - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Options Outstanding
Outstanding at beginning of period (in shares)	981,410	1,031,134	1,210,689
Granted (in shares)	779,740	352,043	0
Vested (in shares)	(217,695)	(223,387)	0
Forfeited (in shares)	(153,033)	(178,380)	(179,555)
Outstanding at end of period (in shares)	1,390,422	981,410	1,031,134
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 5.07	$ 4.39	$ 4.38
Granted (in dollars per share)	7.11	7.18	0
Vested (in dollars per share)	6.13	5.32	0
Forfeited (in dollars per share)	5.38	5.02	4.31
Outstanding at end of period (in dollars per share)	$ 5.93	$ 5.07	$ 4.39