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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018
Effective income tax rate [Abstract] |  |
Effective tax rate as reported | 8.60% | 22.80%
Certain discrete items | $ 0.4 |
The Tax Act [Abstract] |  |
Effective Tax Rate excluding the impact of non-recurring items from the Tax Act | 22.50% |

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