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Stockholders' Equity (Details) (USD $)
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0 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Aug. 04, 2014
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2012
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Aug. 04, 2014
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Sep. 30, 2014
Series A Junior Participating Preferred Stock [Member]
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Sep. 30, 2014
Accelerated Share Repurchases, Date [Domain]
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Aug. 14, 2014
Common Stock [Member]
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Sep. 30, 2014
Common Stock [Member]
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Sep. 30, 2013
Common Stock [Member]
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Sep. 30, 2012
Common Stock [Member]
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Aug. 14, 2014
Additional Paid-in Capital [Member]
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Sep. 30, 2014
Additional Paid-in Capital [Member]
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Sep. 30, 2013
Additional Paid-in Capital [Member]
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Sep. 30, 2012
Additional Paid-in Capital [Member]
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| Class of Stock [Line Items] | |||||||||||||||
| Preferred stock, shares authorized | 5,000,000 | 5,000,000 | 500,000 | ||||||||||||
| Common stock, shares authorized | 500,000,000 | 500,000,000 | |||||||||||||
| Stock authorized to repurchase | $ 600,000,000 | $ 100,000,000 | |||||||||||||
| Accelerated Share Repurchases, Settlement (Payment) or Receipt | 125,000,000 | ||||||||||||||
| Common stock repurchase holdback | 187,415,000 | 23,000 | 87,500,000 | 37,500,000 | |||||||||||
| Repurchases of common stock, shares | 5,068,000 | 3,053,000 | 1,553,000 | 2,300,000 | 5,068,000 | 3,053,000 | 1,553,000 | ||||||||
| Percentage of initial shares to total fixed purchase price | 70.00% | ||||||||||||||
| Maximum shares that could be issued under Accelerated Share Repurchase program | 25,000,000 | ||||||||||||||
| Maximum % of shares that could be issued under Accelerated Share Repurchase Plan | 20.00% | ||||||||||||||
| Repurchases of common stock, value | $ 224,915,000 | $ 74,871,000 | $ 34,953,000 | $ 51,000 | $ 31,000 | $ 15,000 | $ 187,364,000 | $ 74,840,000 | $ 34,938,000 | ||||||
| Shares that would be deliverable upon settlement of accelerated share repurchase plan | 982,419 | ||||||||||||||