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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 02, 2020 | Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Tax Credit Carryforward [Line Items] |  |  |  |
Foreign Investment Tax Credit | $ 0.8 | $ 2.0 | $ 9.8 |
Change in Tax Reserve | 2.2 | (0.1) | 0.1 |
Foreign withholding taxes | 2.3 |  |  |
Income tax expense (benefit) | $ 25.3 | $ 12.0 | $ 66.6 |
Income tax at statutory rate (as a percent) | 21.00% | 21.00% | 30.50% | 35.00%
Deferred tax liabilities | $ 10.2 | $ 2.1 |  |
Valuation allowance | 7.0 | 6.3 |  |
Gross unrecognized tax benefits | 5.2 | 3.1 | $ 1.4 |
Federal |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 7.9 |  |  |
Federal income tax benefit | 5.3 |  |  |
State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 4.7 |  |  |
Federal income tax benefit | 1.7 |  |  |
Foreign tax authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | $ 0.3 |  |  |
Foreign tax authority | Investment Tax Credit Carryforward | Malta |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Percentage of qualified expenditures subject to investment tax credit | 30.00% |  |  |
Foreign tax authority | Tax Credit Carryforward, Period, Indefinite | Investment Tax Credit Carryforward | Malta |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Total unused credits | $ 25.9 |  |  |
Impact of U.S. Tax Reform |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax expense (benefit) |  | $ (4.8) | $ 53.7 |

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