Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jul. 27, 2019	Apr. 27, 2019
Indefinite-lived Intangible Assets [Line Items]
Gross	$ 1.8	$ 1.8
Net	1.8	1.8
Finite-lived Intangible Assets [Roll Forward]
Gross	320.2	320.0
Accumulated Amortization	61.6	56.9
Net / Total	258.6	263.1
Intangible assets, gross	322.0	321.8
Intangible assets, net	260.4	264.9
Trade Names, Patents and Technology Licenses
Indefinite-lived Intangible Assets [Line Items]
Gross	1.8	1.8
Net	1.8	1.8
Customer Relationships and Agreements
Finite-lived Intangible Assets [Roll Forward]
Gross	244.6	244.5
Accumulated Amortization	30.9	27.7
Net / Total	$ 213.7	$ 216.8
Wtd. Avg. Remaining Amortization Periods (Years)	17 years 2 months 12 days	17 years 4 months 24 days
Trade Names, Patents and Technology Licenses
Finite-lived Intangible Assets [Roll Forward]
Gross	$ 75.6	$ 75.5
Accumulated Amortization	30.7	29.2
Net / Total	$ 44.9	$ 46.3
Wtd. Avg. Remaining Amortization Periods (Years)	8 years 1 month 6 days	8 years 4 months 24 days