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Intangible Assets and Goodwill - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 28, 2018 | Apr. 29, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Other Intangibles, Less Accumulated Amortization | $ 61.0 | $ 6.6
Finite-Lived And Indefinite-Lived Intangible Assets, Excluding Goodwill, Gross | 102.1 | 42.2
Finite-Lived Intangible Assets, Accumulated Amortization | 41.1 | 35.6
Trade Names, Patents And Technology Licences [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other Intangibles, Less Accumulated Amortization | $ 14.7 | $ 5.9
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period | 5 years 3 months 15 days | 1 year 4 months 24 days
Finite-Lived Intangible Assets, Gross | $ 37.7 | $ 25.8
Finite-Lived Intangible Assets, Accumulated Amortization | 23.0 | 19.9
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Net | $ 46.3 | $ 0.7
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period | 12 years 4 months | 6 years 9 months 18 days
Finite-Lived Intangible Assets, Gross | $ 64.4 | $ 16.3
Finite-Lived Intangible Assets, Accumulated Amortization | $ 18.1 | 15.6
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Net |  | $ 0.0
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period |  | 4 months 24 days
Finite-Lived Intangible Assets, Gross |  | $ 0.1
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 0.1

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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