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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 29, 2020
Feb. 28, 2014
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Feb. 28, 2020
Feb. 28, 2019
2014 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, capital shares reserved for future issuance (in shares)     750,000        
Number of shares available for grant (in shares)     471,556        
2014 Non-Employee Director Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, capital shares reserved for future issuance (in shares)   150,000 23,000        
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested restricted stock outstanding (in shares)     199,919 154,034      
Compensation expense     $ 2.0 $ 2.9 $ 3.3    
Amounts not yet recognized related to non-vested stock totaled     $ 1.1 1.2      
Weighted average remaining contractual life     1 year 6 months        
Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     3 years        
Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan | Time Based Restricted Stock Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     3 years        
Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan | Performance Based Restricted Stock Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     3 years        
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense     $ 0.5 $ 0.6 $ 0.5    
Weighted average remaining contractual life     6 months        
Restricted Stock | Vesting of First Anniversary              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage   50.00%          
Restricted Stock | Vesting of Second Anniversary              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage   50.00%          
Restricted Stock | 2014 Non-Employee Director Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested restricted stock outstanding (in shares)     8,400 8,400      
Maximum number of shares granted to any individual (in shares)   12,000          
Number of shares issued to any individual (in shares)   4,000          
Restricted stock issuable to eligible Board of Directors members annually (in shares)   2,400          
Shares issued under the plan (in shares) 16,800            
Shares issued, price per share (in dollars per share)           $ 31.33 $ 36.25
Minimum | Restricted Stock Units (RSUs) | Time Based Restricted Stock Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Actual amount of RSUs earned based on cumulative earnings     50.00%        
Minimum | Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan | Performance Based Restricted Stock Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target RSUs granted range     40.00%        
Maximum | Restricted Stock Units (RSUs) | Time Based Restricted Stock Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Actual amount of RSUs earned based on cumulative earnings     60.00%        
Maximum | Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan | Performance Based Restricted Stock Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target RSUs granted range     50.00%