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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2018
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2014
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
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)         633,011    
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 70,600    
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested restricted stock outstanding (in shares)         190,500 177,737  
Compensation expense         $ 2.7 $ 2.0 $ 4.2
Amounts not yet recognized related to non-vested stock totaled         $ 1.2 1.6  
Weighted average remaining contractual life         1 year 3 months 18 days    
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%    
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    
Target RSUs granted range         40.00%    
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense         $ 0.5 $ 0.7 $ 0.7
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)         7,000 16,000  
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)       2,000      
Shares issued under the plan (in shares) 1,000 6,000 17,000        
Shares issued, price per share (in dollars per share) $ 27.15 $ 27.88 $ 34.24