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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Current: |  |  |
Federal | $ (2,142) | $ 1,646 | $ 5,268
State | 384 | 868 | 1,158
Foreign | 1,151 | 1,205 | 863
Deferred: |  |  |
Federal | (2,725) | 3,693 | (1,625)
State | (390) | 27 | (397)
Foreign | (264) | (572) | (21)
Income tax (benefit) expense | $ (3,986) | $ 6,867 | $ 5,246

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