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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Apr. 30, 2018
Effective income tax rate [Abstract] |  |  |
Effective tax rate as reported | 22.80% | (51.50%) |
Impact of restructuring and impairment charges | (0.10%) | 69.60% |
Effective tax rate excluding the impact of restructuring and impairment charges | 22.70% | 18.10% |
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 Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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