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Earnings Per Common Share (Tables) | 12 Months Ended
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Apr. 30, 2012
Earnings Per Common Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
|  | Years ended April 30,
|  | 2012 |  | 2011 |  | 2010
Basic |  |  |  |  |  |
Net earnings | $ | 116,791 | $ | 94,623 | $ | 116,962
Weighted average shares outstanding-basic |  | 38,068,001 |  | 42,284,664 |  | 50,899,370
Basic earnings per common share | $ | 3.07 | $ | 2.24 | $ | 2.30
Diluted |  |  |  |  |  |
Net earnings | $ | 116,791 | $ | 94,623 | $ | 116,962
Weighted-average shares outstanding-basic |  | 38,068,001 |  | 42,284,664 |  | 50,899,370
Plus effect of stock options and restricted stock units |  | 323,703 |  | 281,913 |  | 153,803
Weighted-average shares outstanding-diluted |  | 38,391,704 |  | 42,566,577 |  | 51,053,173
Diluted earnings per common share | $ | 3.04 | $ | 2.22 | $ | 2.29

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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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