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Earnings per Share (Tables) | 12 Months Ended
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Apr. 30, 2015
Earnings Per Share [Abstract] |
Computation of earnings per common share, basic and diluted |
|  | Year Ended April 30, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Net income |  | $ | 344.9 |  |  | $ | 565.2 |  |  | $ | 544.2 |
Net income allocated to participating securities |  |  | 2.2 |  |  |  | 4.5 |  |  |  | 4.7 |
Net income allocated to common stockholders |  | $ | 342.7 |  |  | $ | 560.7 |  |  | $ | 539.5 |
Weighted-average common shares outstanding |  |  | 103,038,271 |  |  |  | 103,504,121 |  |  |  | 107,881,519 |
Dilutive effect of stock options |  |  | 5,283 |  |  |  | 14,346 |  |  |  | 23,256 |
Weighted-average common shares outstanding – assuming dilution |  |  | 103,043,554 |  |  |  | 103,518,467 |  |  |  | 107,904,775 |
Net income per common share |  | $ | 3.33 |  |  | $ | 5.42 |  |  | $ | 5.00 |
Net income per common share – assuming dilution |  | $ | 3.33 |  |  | $ | 5.42 |  |  | $ | 5.00 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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