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Intangible Assets and Goodwill - Schedule of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
May. 02, 2015
May. 03, 2014
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 42.2 $ 42.5
Accumulated Amortization 30.9 29.5
Net 11.3 13.0
Indefinite-lived trade names 1.8 1.8
Customer relationships and agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 16.3 16.6
Accumulated Amortization 15.0 14.7
Net $ 1.3 $ 1.9
Wtd. Avg. Remaining Amortization Periods 8 years 9 months 18 days 9 years 10 months 18 days
Trade names, patents and technology licenses    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 25.8 $ 25.8
Accumulated Amortization 15.8 14.8
Net $ 10.0 $ 11.0
Wtd. Avg. Remaining Amortization Periods 3 years 4 months 6 days 9 years 9 months 18 days
Covenants not to compete    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 0.1 $ 0.1
Accumulated Amortization 0.1 0.0
Net $ 0.0 $ 0.1
Wtd. Avg. Remaining Amortization Periods 2 years 5 months 3 years 5 months