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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2019 | Apr. 30, 2018 | Feb. 28, 2018 | Feb. 28, 2014 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
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) |  |  |  |  | 554,801 |  |
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 | 56,600 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unvested restricted stock outstanding (in shares) |  |  |  |  | 131,850 | 190,500 |
Compensation expense |  |  |  |  | $ 3.3 | $ 2.7 | $ 2.0
Amounts not yet recognized related to non-vested stock totaled |  |  |  |  | $ 1.0 | 1.2 |
Weighted average remaining contractual life |  |  |  |  | 1 year 5 months 9 days |  |
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 | $ 0.5 | $ 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 | 7,000 |
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) | 7,000 | 1,000 | 6,000 |  |  |  |
Shares issued, price per share (in dollars per share) | $ 34.02 | $ 27.15 | $ 27.88 |  |  |  |
Common Stock | 2014 Non-Employee Director Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued under the plan (in shares) | 7,000 |  |  |  |  |  |
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% |  |

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