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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Apr. 30, 2018
Effective income tax rate [Abstract] |  |  |  |  |
Effective tax rate as reported | 22.30% | 24.40% | 22.50% | 19.00% |
Effective tax rate excluding the impact of restructuring and impairment charges |  |  | 22.50% | 24.40% |
The Tax Act [Abstract] |  |  |  |  |
Provisional estimated net tax benefit related to the Tax Act |  |  |  |  | $ (25.1)
Federal statutory tax rate |  |  | 21.00% |  |

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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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