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Stock-Based Compensation - Summary of Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of Shares    
Ending balance (in shares) 5,655  
Exercised (in shares)   (3,700)
Beginning balance (in shares) 9,355  
Exercisable (in shares) 5,655 9,355
Weighted Average Exercise Price    
Beginning balance (in dollars per share) $ 17.18  
Exercised (in dollars per share)   $ 17.18
Ending balance (in dollars per share) 17.18  
Exercisable (in dollars per share) $ 17.18 $ 17.18
Weighted Average Remaining Contractual Term    
Outstanding 3 months 18 days  
Exercisable 3 months 18 days 1 year 3 months 18 days
Aggregate Intrinsic Value    
Outstanding $ 0.2  
Exercisable $ 0.2 $ 0.3
Closing market value of common stock (in dollars per share) $ 55.32