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Stock-based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 2.3 $ 2.1  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs related to non-vested stock options award $ 0.1   $ 0.1
Weighted average period to recognize remaining cost 11 months 12 days    
Performance-Based Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Performance based restricted stock settled in cash payment (in shares) 135,337    
Cash settlement of performance-based restricted stock $ 2.1    
Nonvested Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average period to recognize remaining cost 2 years 1 month 24 days    
Unrecognized compensation costs related to non-vested stock awards $ 16.0   $ 9.0