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Stockholders' Equity (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2015 | Sep. 14, 2017 | Sep. 30, 2016 | Aug. 04, 2014
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | 5,000,000 |  |  | 5,000,000 |
Common stock, shares authorized | 500,000,000 |  |  | 500,000,000 |
Stock authorized to repurchase |  |  | $ 500,000,000 |  | $ 600,000,000
Repurchases of common stock, value | $ 50,991,000 | $ 64,940,000 |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | 500,000 |  |  |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchases of common stock, shares | 946,000 | 2,728,000 |  |  |
Repurchases of common stock, value | $ 10,000 | $ 27,000 |  |  |

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