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Basic and Diluted Earnings Per Share (Tables) | 6 Months Ended
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Oct. 31, 2012
Basic And Diluted Earnings Per Share | The following table summarizes basic and diluted earnings per share calculations:
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
|  | (in thousands, except per share data) |
Net earnings attributable to common stockholders |  | $ | 1,196 |  |  | $ | 15,147 |  |  | $ | 11,614 |  |  | $ | 30,558 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 47,269 |  |  |  | 46,499 |  |  |  | 47,040 |  |  |  | 46,234 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock |  |  | 397 |  |  |  | 392 |  |  |  | 442 |  |  |  | 573 |
Stock options |  |  | 168 |  |  |  | 219 |  |  |  | 176 |  |  |  | 329 |
ESPP |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | 15 |
Diluted weighted-average number of common shares outstanding |  |  | 47,834 |  |  |  | 47,114 |  |  |  | 47,658 |  |  |  | 47,151 |
Net earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 0.03 |  |  | $ | 0.33 |  |  | $ | 0.25 |  |  | $ | 0.66 |
Diluted earnings per share |  | $ | 0.03 |  |  | $ | 0.32 |  |  | $ | 0.24 |  |  | $ | 0.65 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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