GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Jan. 26, 2019	Apr. 28, 2018
Finite-lived Intangible Assets [Roll Forward]
Gross	$ 319.6	$ 102.1
Accumulated Amortization	52.0	41.1
Net	267.6	61.0
Customer Relationships and Agreements
Finite-lived Intangible Assets [Roll Forward]
Gross	242.1	64.4
Accumulated Amortization	24.4	18.1
Net	$ 217.7	$ 46.3
Wtd. Avg. Remaining Amortization Periods (Years)	17 years 7 months 27 days	12 years 4 months
Trade Names, Patents and Technology Licenses
Finite-lived Intangible Assets [Roll Forward]
Gross	$ 77.5	$ 37.7
Accumulated Amortization	27.6	23.0
Net	$ 49.9	$ 14.7
Wtd. Avg. Remaining Amortization Periods (Years)	6 years 8 months 6 days	5 years 3 months 15 days