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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Option price (in dollars per share) | $ 27.15 |  |  |  |  |  |  |
Period of consecutive trading days | 20 days |  |  |  |  |  |  |
Period following an executive's termination of employment for a number of reasons | 18 months |  |  |  |  |  |  |
Shares of common stock authorized to be repurchased (up to) (in shares) |  |  |  |  |  |  | 50,000 | 170,000
Shares available to purchase (in shares) |  |  |  |  |  |  | 0 |
Value of treasury stock shares purchased |  | $ 4,586 |  | $ 4,586 |  |  | $ 4,585 |
Corporate, General and Administrative Expense |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 190 | $ 251 | $ 629 | $ 446 |  |  |
Remy W. Trafelet |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Options granted in period (in shares) | 300,000 |  |  |  |  |  |  |
George R. Brokaw |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Options granted in period (in shares) | 225,000 |  |  |  |  |  |  |
Henry R. Slack |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Options granted in period (in shares) | 225,000 |  |  |  |  |  |  |
Tranche One |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Percentage of options | 25.00% |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ 60.00 |  |  |  |  |  |  |
Tranche Two |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Percentage of options | 25.00% |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ 75.00 |  |  |  |  |  |  |
Tranche Three |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Percentage of options | 25.00% |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ 90.00 |  |  |  |  |  |  |
Tranche Four |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Percentage of options | 25.00% |  |  |  |  |  |  |
Amount per share (in dollars per share) | $ 105.00 |  |  |  |  |  |  |
Stock Option |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Options granted in period (in shares) |  |  |  | 0 |  |  |  |
Weighted average grant date fair value of option grant (in dollars per share) |  | $ 3.53 |  | $ 3.53 |  |  |  |
Stock options exercised (in shares) |  |  |  | 0 |  |  |  |
Stock options forfeited (in shares) |  |  |  | 0 |  |  |  |
Unrecognized compensation cost |  | $ 2,441 |  | $ 2,441 |  |  |  |
Weighted average period of cost expected to be recognized |  |  |  | 3 years 1 month 12 days |  |  |  |
Stock-based compensation expense |  | $ 205 |  |  |  |  |  |
2017 Authorization Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock shares purchased (in shares) |  | 24,502 |  | 24,502 |  |  |  |
Value of treasury stock shares purchased |  | $ 641,000 |  | $ 641,000 |  |  |  |
2017 Authorization Program | Scenario, Forecast |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares of common stock authorized to be repurchased (up to) (in shares) |  |  |  |  |  | 5,000,000 |  |

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