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COMMON STOCK AND STOCK-BASED COMPENSATION (Details) - Two Thousand Fourteen Stock Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Restricted Stock Awards (RSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Multiplier - threshold performance			50.00008%
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	$ 0.6	$ (5.4)	$ 9.7	$ (2.2)
Allocated share-based compensation expense, amount recorded to true-up prior periods			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			$ 17.0
Compensation expense	$ 0.2	$ 1.5	$ 1.1	$ 4.5
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		646,675
Outstanding (in shares)	329,497		329,497
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)			332,542.6666666667
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)			665,085
EBITDA goal			$ 221.0
Expected expense			$ 22.1
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)			997,628
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
Change in estimated level of performance from target to threshold levels | Restricted Stock Awards (RSAs) | Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ (6.0)

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