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Income Taxes (Narrative) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate (as a percent) | 25.90% | 23.70% | 26.00% | 24.90%

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