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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Class of Stock [Line Items] |  |
Stock repurchased (in shares) | 4,868,357 | 3,137,178
Additional shares authorized to be repurchased (in shares) | 2,032,598 |
Warrants issued (in shares) | 1,707,456 |
Warrant exercise price (in dollars per share) | $ 17.31 |
Warrants repurchased during period (in shares) | 227,281 |
Value of warrants | $ 3,914 |
Warrants outstanding (in shares) | 102,936 | 330,217
Weighted Average |  |
Class of Stock [Line Items] |  |
Weighted average cost of repurchased stock (in dollars per share) | $ 33.74 | $ 31.36

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