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COMMON STOCK AND STOCK-BASED COMPENSATION (Details) - Two Thousand Fourteen Stock Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Oct. 28, 2017
Restricted Stock Awards (RSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Multiplier - threshold performance			50.00%
Multiplier - target performance			100.00%
Multiplier - maximum performance			150.00%
EBITDA goal, percentage of likelihood			70.00%
Restricted Stock Awards (RSAs) | Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 8.1	$ 1.7	$ 9.1	$ 3.2
Allocated share-based compensation expense, amount recorded to true-up prior periods	7.4		7.4
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			$ 17.6
Compensation expense	$ 0.8	$ 1.5	$ 0.9	$ 3.0
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		646,675
Outstanding (in shares)	339,022		339,022
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)			344,418
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)			688,836
EBITDA goal			$ 221.0
Expected expense			$ 22.9
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)			1,033,253
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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