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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	8 Months Ended	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018	Dec. 31, 2017	Jan. 31, 2019	Jan. 31, 2018
Effective income tax rate [Abstract]
Effective tax rate as reported	22.70%	(18.10%)			22.60%	4.00%
The Tax Act [Abstract]
Provisional estimated net tax benefit related to the Tax Act		$ 25				$ 25
Effective Tax Rate excluding the impact of non-recurring items from the Tax Act		24.80%				21.40%
Federal statutory tax rate			21.00%	35.00%

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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.

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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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