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COMMON STOCK AND STOCK-BASED COMPENSATION - Narrative (Details) - Two Thousand Fourteen Stock Plan - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jul. 28, 2018 | Jul. 29, 2017
Restricted Stock Awards (RSAs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Multiplier - Threshold Performance | 50.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, EBITDA Goal, Percentage of Likelihood | 70.00% |
Multiplier - Target Performance | 100.00% |
Multiplier - Maximum Performance | 150.00% |
Restricted Stock Awards (RSAs) | Management |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation expense | $ 1.0 | $ 1.5
Restricted Stock Awards (RSAs) | Independent directors |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation expense | $ 0.9 |
Number of shares issued (in shares) | 24,000 |
Time-Based Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected expense | $ 18.0 |
Compensation expense | $ 0.1 | $ 1.5
Time-Based Restricted Stock Units (RSUs) | Management |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awarded (in shares) | 7,750 |
Granted (in shares) | 646,675 |
Outstanding (in shares) | 346,897 |
Time-Based Restricted Stock Units (RSUs) | Percentage Vesting on April 28, 2018 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percent | 30.00% |
Time-Based Restricted Stock Units (RSUs) | Percentage Vesting on April 27, 2019 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percent | 30.00% |
Time-Based Restricted Stock Units (RSUs) | Percentage Vesting on May 2, 2020 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percent | 40.00% |
2020 EBITDA Threshold Performance | Restricted Stock Awards (RSAs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares represented (in shares) | 350,043 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, EBITDA Goal | $ 198.9 |
Expected expense | $ 11.9 |
2020 EBITDA Target Performance | Restricted Stock Awards (RSAs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares represented (in shares) | 700,086 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, EBITDA Goal | $ 221.0 |
2020 EBITDA Maximum Performance | Restricted Stock Awards (RSAs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares represented (in shares) | 1,050,128 |
2020 EBITDA Maximum Performance | Restricted Stock Awards (RSAs) | Management |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awarded (in shares) | 11,625 |

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