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Income Taxes (Tables) | 3 Months Ended
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Jul. 27, 2018
Income Tax Disclosure [Abstract] |
Effective Tax Rates | Our effective tax rates for the periods presented were as follows:
|  | Three Months Ended |
|  | July 27, 2018 |  |  | July 28, 2017 |
Effective tax rates |  |  | (4.0 | )% |  |  | 9.7 | %

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