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Common Stock and Stock Compensation - Restricted Stock Award Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Restricted stock      
Shares      
Outstanding, beginning balance (in shares) 2,218,777    
Granted (in shares) 1,304,764    
Released (in shares) (496,535)    
Cancelled (in Shares) (913,683)    
Outstanding, ending balance (in shares) 2,113,323 2,218,777  
Weighted Average Grant Date Fair Value      
Outstanding, beginning balance (usd per share) $ 4.86    
Granted (usd per share) 7.24 $ 4.92 $ 5.73
Released (usd per share) 4.84    
Cancelled (usd per share) 5.91    
Outstanding, ending balance (usd per share) $ 5.88 4.86  
Number of shares withheld to satisfy related federal income tax withholding (in shares) 103,515    
Weighted average grant-date fair value per share granted (usd per share) $ 7.24 $ 4.92 $ 5.73
Restricted Stock and Phantom Share-Based Awards      
Weighted Average Grant Date Fair Value      
Total market value of shares released $ 3.7 $ 3.4 $ 5.1