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Stockholders' Equity - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
May 31, 2022
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]            
Preferred stock outstanding (in shares) 0          
Common stock authorized (in shares) 63,000,000 63,000,000        
Common stock issued (in shares) 30,880,138 31,294,198        
Common stock outstanding (in shares) 30,880,138 31,294,198        
Authorized amount repurchase of common stock       $ 50,000,000   $ 50,000,000
Remaining availability repurchase amount $ 41,800,000       $ 12,000,000  
Share repurchases (in shares) 570,000   362,000      
Aggregate repurchased value $ 8,154,000 $ 0 $ 3,327,000      
Shares repurchased, average price per share (in usd per share) $ 14.33   $ 9.20      
Dividends paid $ 0 $ 0 $ 0      
382 ownership limitation 4.95%