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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