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Restructuring - Schedule of Restructuring Activity (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	Oct. 31, 2020	Oct. 31, 2020	May 02, 2020	Oct. 26, 2019	Oct. 31, 2020	Oct. 26, 2019
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	$ 2.8	$ 4.2	$ 0.2	$ 0.5	$ 7.6	$ 0.5
Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs					(4.3)
Non Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs					(0.7)
Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	2.2		$ 0.2		6.3
Employee Termination Benefits [Member] | Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs					(4.3)
Asset Impairment Charges [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs					0.7
Asset Impairment Charges [Member] | Non Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs					(0.7)
Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	$ 0.6				$ 0.6

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+ References

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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