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Shareholders' Equity - Stock-based Compensation Expense (Benefit) (Details) - 2014 Incentive Plan - USD ($) $ in Millions | 12 Months Ended
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May 02, 2020 | Apr. 27, 2019 | Apr. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 0.3 | $ 14.0 | $ 4.0
Unrecognized equity-based compensation cost | 0.0 |  |
RSAs | Executives and non-executive members of management |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | (2.1) | 10.9 | (2.0)
Unrecognized equity-based compensation cost | 0.0 |  |
RSAs | Independent directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 0.9 | 0.9 | 1.0
Unrecognized equity-based compensation cost | 0.0 |  |
RSUs | Executives and non-executive members of management |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 1.5 | $ 2.2 | $ 5.0
Unrecognized equity-based compensation cost | $ 0.0 |  |

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