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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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