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Income Taxes - Schedule of Effective Tax Rate from Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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May 02, 2020 | Apr. 27, 2019 | May 02, 2020 | Apr. 27, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Income (loss) before income taxes | $ (45,252) | $ (2,713) | $ (34,326) | $ 26,737
Provision (benefit) for income taxes | $ (11,349) | $ (9,761) | $ (11,676) | $ (2,965)
Effective tax rate | (25.10%) | (359.80%) | (34.00%) | (11.10%)

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