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Shareholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 26, 2019 | Oct. 31, 2020 | Oct. 26, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 0.0 |  | $ 0.0 |
2014 Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 1.0 | $ 1.5 | 1.9 | $ 4.0
2014 Incentive Plan | PSAs | Executives and non-executive members of management |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | 1.1 |  | 2.3
2014 Incentive Plan | RSUs | Executives and non-executive members of management |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 1.0 | $ 0.4 | 1.0 | 0.8
2014 Incentive Plan | RSAs | Director |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 0.9 | $ 0.9

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