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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Jan. 26, 2019 | May 02, 2020 | Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax assets, gross |  |  | $ 19,094 | $ 15,808 |  |
Deferred tax asset valuation allowance |  |  | 1,189 | 893 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | $ 2,775 | 159 | 2,741 |  |
Deferred Other Tax Expense (Benefit) |  | $ 480 |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  | 30.40% | 35.00%
Accrued interest or penalties |  |  | 30 | $ 26 |  |
International |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 4,832 |  |  |
Deferred tax assets, gross |  |  | 919 |  |  |
Ireland and Belgium [Domain] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax asset valuation allowance |  |  | $ 627 |  |  |

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