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Stockholders' Equity - Narrative (Details) (USD $) | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Equity [Abstract] |  |
Stock repurchased | 6,315,196 | 2,895,484
Weighted average cost of repurchased stock | $ 17.46 | $ 14.48
Additional shares authorized to be repurchased | 9,872,834 |
Warrants issued (in shares) | 1,707,456 |
Warrant exercise price (in dollars per share) | 17.57 |
Warrants outstanding | 1,700,856,000 |

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- Details
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