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Shareholders' Equity - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 02, 2020 | Feb. 01, 2020 | Oct. 26, 2019 | Jul. 27, 2019 | Apr. 27, 2019 | Jan. 26, 2019 | Oct. 27, 2018 | Jul. 28, 2018 | May 02, 2020 | Apr. 27, 2019 | Apr. 28, 2018 | Apr. 30, 2007
2014 Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | 3,000,000 |  |  |  |  |  |  |  | 3,000,000 |  |  |
Stock-based compensation, description |  |  |  |  |  |  |  |  | The number of shares of common stock originally authorized under the 2014 Plan is 3,000,000, less one share for every one share of common stock issued or issuable pursuant to awards made after May 3, 2014 under the 2007 Plan or 2010 Plan. |  |  |
Number of shares available for award (in shares) | 1,897,442 |  |  |  |  |  |  |  | 1,897,442 |  |  |
Compensation expense |  |  |  |  |  |  |  |  | $ 0.3 | $ 14.0 | $ 4.0 |
Deferred RSU's | 121,200 |  |  |  |  |  |  |  | 121,200 |  |  |
2014 Incentive Plan | RSAs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
EBITDA goal, percentage of likelihood |  |  |  |  |  |  |  |  | 70.00% |  |  |
Number of restricted stock, vested |  |  |  |  |  |  |  |  | 444,500 |  |  |
2014 Incentive Plan | RSAs | Independent directors |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  | $ 0.9 | $ 0.9 | $ 1.0 |
Number of shares issued (in shares) |  |  |  |  |  |  |  |  | 30,000 | 24,000 | 24,000 |
2014 Incentive Plan | RSAs | Executives and non-executive members of management |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense, amount recorded to true-up prior periods | $ (6.5) | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 7.4 | $ 0.0 | $ 5.2 | $ 7.4 | $ 6.0 |
Compensation expense |  |  |  |  |  |  |  |  | $ (2.1) | $ 10.9 | $ (2.0) |
EBITDA hurdle achieved of target | 69.00% |  |  |  |  |  |  |  |  |  |  |
2014 Incentive Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock, vested |  |  |  |  |  |  |  |  | 176,994 | 152,328 | 160,553 |
Number of restricted stock vested for which shares issued |  |  |  |  |  |  |  |  | 91,694 |  |  |
Number of restricted stock vested but deferred for issuance |  |  |  |  |  |  |  |  | 80,800 |  |  |
2014 Incentive Plan | RSUs | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
2014 Incentive Plan | RSUs | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 5 years |  |  |
2014 Incentive Plan | RSUs | Executives and non-executive members of management |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  | $ 1.5 | $ 2.2 | $ 5.0 |
2010 Stock Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred RSU's | 180,000 |  |  |  |  |  |  |  | 180,000 |  |  |
2004 Stock Plan | Converted from Restricted Stock Awards to Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 225,000
2004 Stock Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) | 29,945 |  |  |  |  |  |  |  | 29,945 |  |  |
Converted RSUs delivered (in shares) |  |  |  |  |  |  |  |  | 195,055 |  |  |

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