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Stockholders' Equity - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |
Shares of common stock authorized to be repurchased (up to) (in shares) | 50,000 |  | 170,000
Shares available to purchase (in shares) | 50,000 |  |
Corporate, General and Administrative Expense |  |  |
Class of Stock [Line Items] |  |  |
Stock-based compensation expense | $ 440 | $ 210 |

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