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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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, excluding the impact of non-recurring items from the Tax Act and the foreign court decision and tax rate change.

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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.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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