Common Stock and Stock Compensation - Restricted Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Restricted stock
Shares
Outstanding, beginning balance (in shares)	2,113,323
Granted (in shares)	1,010,750
Released (in shares)	(490,145)
Cancelled (in Shares)	(78,029)
Outstanding, ending balance (in shares)	2,555,899	2,113,323
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in dollars per share)share)	$ 5.88
Granted (in dollars per share)	7.82	$ 7.24	$ 4.92
Released (in dollars per share)	4.94
Cancelled (in dollars per share)	6.70
Outstanding, ending balance (in dollars per share)	$ 6.80	5.88
Number of shares withheld to satisfy related federal income tax withholding (in shares)	118,011
Weighted average grant-date fair value per share granted (in dollars per share)	$ 7.82	$ 7.24	$ 4.92
Restricted Stock and Phantom Share-Based Awards
Weighted Average Grant Date Fair Value
Total market value of shares released	$ 4.7	$ 3.7	$ 3.4