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COMMON STOCK AND STOCK-BASED COMPENSATION - Narrative (Details) - Two Thousand Fourteen Stock Plan - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 28, 2017 | Jul. 29, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Oct. 28, 2017 | Oct. 29, 2016
Restricted Stock Awards (RSAs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Multiplier - Threshold Performance |  |  |  |  | 50.00006% |
Multiplier - Target Performance |  |  |  |  | 100.00% |
Multiplier - Maximum Performance |  |  |  |  | 150.00006% |
Expected expense |  |  |  |  | $ 28.0 |
Restricted Stock Awards (RSAs) | Management |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense | $ 1.7 |  |  | $ 1.7 | 3.2 | $ 3.0
Restricted Stock Awards (RSAs) | Independent directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  |  |  |  | 1.0 |
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 |  |  |  |  | 19.5 |
Compensation expense | $ 1.5 |  | $ 1.6 |  | $ 3.0 | $ 2.8
Time-Based Restricted Stock Units (RSUs) | Management |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awarded (in shares) |  | 23,175 |  |  |  |
Granted (in shares) | 631,175 |  |  |  | 631,175 |
Outstanding (in shares) | 567,175 |  |  |  | 567,175 |
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) |  |  |  |  | 410,538 |
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) |  |  |  |  | 821,075 |
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) |  |  |  |  | 1,231,613 |
2020 EBITDA Maximum Performance | Restricted Stock Awards (RSAs) | Management |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awarded (in shares) |  | 117,113 |  |  |  |

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