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Stockholders' Equity (Details) - $ / shares | Oct. 08, 2015 | Dec. 15, 2008 | Jun. 30, 2017 | Sep. 30, 2016
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Class of Stock [Line Items] |  |  |  |
Common stock, par value (USD per share) |  |  | $ 0.01 | $ 0.01
Minimum percent ownership of common stock for exercise of rights |  | 15.00% |  |
Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, par value (USD per share) |  | $ 0.01 |  |
Number of securities called by warrants or rights (in shares) |  | 0.001 |  |
Exercise price of rights (USD per share) |  | $ 51.60 |  |
Rights expiration period |  | 10 years |  |
Collective ownership threshold for joint filers | 19.90% |  |  |

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