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Earnings per Share (Tables) | 12 Months Ended
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Sep. 30, 2011
Earnings per Share [Abstract] |
Net components of basic and diluted earnings per share |
|  | Years Ended September 30, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (In thousands, except per share amounts) |
Net income (A) |  | $ | 122,159 |  |  | $ | 97,294 |  |  | $ | 68,472 |
Weighted average outstanding shares of common stock (B) |  |  | 49,917 |  |  |  | 49,033 |  |  |  | 47,372 |
Dilutive effect of stock options and restricted stock |  |  | 452 |  |  |  | 543 |  |  |  | 704 |
Weighted average common stock and common stock equivalents (C) |  |  | 50,369 |  |  |  | 49,576 |  |  |  | 48,076 |
Basic earnings per share (A/B) |  | $ | 2.45 |  |  | $ | 1.98 |  |  | $ | 1.45 |
Diluted earnings per share (A/C) |  | $ | 2.43 |  |  | $ | 1.96 |  |  | $ | 1.42 |
Potential common shares excluded from the calculation of diluted earnings per share |  |  | 2 |  |  |  | 15 |  |  |  | 124 |

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