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Earnings per Share (Tables) | 9 Months Ended
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Jun. 30, 2011
Earnings Per Share [Abstract] |
Net components of basic and diluted earnings per share |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Net income (A) |  | $ | 26,527 |  |  | $ | 19,962 |  |  | $ | 85,794 |  |  | $ | 69,442 |
Weighted average outstanding shares of common stock (B) |  |  | 49,926 |  |  |  | 49,201 |  |  |  | 49,849 |  |  |  | 48,969 |
Dilutive effect of stock options and restricted stock |  |  | 459 |  |  |  | 439 |  |  |  | 443 |  |  |  | 572 |
Weighted average common stock and common stock equivalents (C) |  |  | 50,385 |  |  |  | 49,640 |  |  |  | 50,292 |  |  |  | 49,541 |
Basic earnings per share (A/B) |  | $ | 0.53 |  |  | $ | 0.41 |  |  | $ | 1.72 |  |  | $ | 1.42 |
Diluted earnings per share (A/C) |  | $ | 0.53 |  |  | $ | 0.40 |  |  | $ | 1.71 |  |  | $ | 1.40 |
Potential common shares excluded from the calculation of diluted earnings per share |  |  | — |  |  |  | 5 |  |  |  | 6 |  |  |  | 6 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + Details
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