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Intangible Assets and Goodwill - Schedule of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2016
May 02, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 42.2 $ 42.2
Accumulated Amortization 33.3 30.9
Net 8.9 11.3
Indefinite-lived trade names 1.8 1.8
Customer relationships and agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 16.3 16.3
Accumulated Amortization 15.3 15.0
Net $ 1.0 $ 1.3
Wtd. Avg. Remaining Amortization Periods 7 years 9 months 15 days 8 years 9 months 18 days
Trade names, patents and technology licenses    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 25.8 $ 25.8
Accumulated Amortization 17.9 15.8
Net $ 7.9 $ 10.0
Wtd. Avg. Remaining Amortization Periods 2 years 4 months 21 days 3 years 4 months 6 days
Covenants not to compete    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 0.1 $ 0.1
Accumulated Amortization 0.1 0.1
Net $ 0.0 $ 0.0
Wtd. Avg. Remaining Amortization Periods 1 year 5 months 2 years 5 months