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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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