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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 26, 2019 | Jan. 27, 2018 | Jan. 26, 2019 | Jan. 27, 2018 | Apr. 28, 2018
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 26.90% | 62.00% | 24.60% | 43.90% |
Statutory tax rate (as a percent) |  |  | 21.00% |  | 30.40%
Effective tax rate absent discrete adjustments (as a percent) | 26.70% |  | 25.60% |  |
Estimated effects of the transition tax |  |  | $ 0.2 |  |

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