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Earnings Per Common Share (Tables) | 12 Months Ended
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Apr. 30, 2013
Net Income Per Common Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
|  | Years ended April 30,
|  | 2013 |  | 2012 |  | 2011
Basic |  |  |  |  |  |
Net income | $ | 110,625 | $ | 116,791 | $ | 94,623
Weighted average shares outstanding-basic |  | 38,297,083 |  | 38,068,001 |  | 42,284,664
Basic earnings per common share | $ | 2.89 | $ | 3.07 | $ | 2.24
Diluted |  |  |  |  |  |
Net income | $ | 110,625 | $ | 116,791 | $ | 94,623
Weighted-average shares outstanding-basic |  | 38,297,083 |  | 38,068,001 |  | 42,284,664
Plus effect of stock options and restricted stock units |  | 322,993 |  | 323,703 |  | 281,913
Weighted-average shares outstanding-diluted |  | 38,620,076 |  | 38,391,704 |  | 42,566,577
Diluted earnings per common share | $ | 2.86 | $ | 3.04 | $ | 2.22

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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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