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Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2015
Accounting Policies [Abstract] |
Share based payments |
|  | Year Ended April 30, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Share-based compensation expense included in selling, distribution, and administrative expenses |  | $ | 22.3 |  |  | $ | 22.1 |  |  | $ | 20.5 |
Share-based compensation expense included in other special project costs |  |  | 1.2 |  |  |  | 0.8 |  |  |  | 0.8 |
Total share-based compensation expense |  | $ | 23.5 |  |  | $ | 22.9 |  |  | $ | 21.3 |
Related income tax benefit |  | $ | 8.0 |  |  | $ | 7.7 |  |  | $ | 7.1 |

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