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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 03, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2016 | Aug. 14, 2014 | Aug. 04, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 5,000,000 |  | 5,000,000.0 |  |
Common stock, shares authorized |  |  | 500,000,000 |  | 500,000,000 |  |
Stock authorized to repurchase |  | $ 100,000,000 |  | $ 100,000,000 |  |  | $ 600,000,000
Repurchases of common stock, shares |  |  | 2,700,000 | 5,100,000 |  |  |
Repurchases of common stock, value |  |  | $ (64,940,000) | $ (187,415,000) |  |  |
Stock repurchased in the period , including holdback |  |  |  | 224,900,000 |  |  |
Common stock repurchase holdback |  |  |  | 37,500,000 |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 500,000 |  |
Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  |  |  |  | $ 125,000,000 |
Repurchases of common stock, shares | 1,100,000 | 2,300,000 |  |  |  |  |
Common stock repurchase holdback |  |  |  | $ 37,500,000 |  |  |

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