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Basic and Diluted Earnings Per Share (Tables) | 9 Months Ended
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Jan. 31, 2013
Basic And Diluted Earnings Per Share | The following table summarizes basic and diluted earnings per share calculations:
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
|  | (in thousands, except per share data) |
Net earnings attributable to common stockholders |  | $ | 9,482 |  |  | $ | 11,717 |  |  | $ | 21,096 |  |  | $ | 42,275 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 47,367 |  |  |  | 46,528 |  |  |  | 47,149 |  |  |  | 46,332 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock |  |  | 491 |  |  |  | 567 |  |  |  | 426 |  |  |  | 567 |
Stock options |  |  | 157 |  |  |  | 250 |  |  |  | 167 |  |  |  | 279 |
ESPP |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 15 |
Diluted weighted-average number of common shares outstanding |  |  | 48,015 |  |  |  | 47,345 |  |  |  | 47,742 |  |  |  | 47,193 |
Net earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 0.20 |  |  | $ | 0.25 |  |  | $ | 0.45 |  |  | $ | 0.91 |
Diluted earnings per share |  | $ | 0.20 |  |  | $ | 0.25 |  |  | $ | 0.44 |  |  | $ | 0.90 |

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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
Balance Type: | na
Period Type: | duration