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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Nov. 01, 2014
May 03, 2014
Intangible Assets [Line Items]    
Gross $ 42.4 $ 42.5
Accumulated Amortization 30.2 29.5
Net 12.2 13.0
Indefinite-lived trade names 1.8 1.8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2014 1.5  
2015 1.2  
2016 1.1  
2017 1.1  
2018 1.0  
Customer relationships and agreements
    
Intangible Assets [Line Items]    
Gross 16.5 16.6
Accumulated Amortization 14.9 14.7
Net 1.6 1.9
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period 9 years 4 months 3 days 9 years 10 months 18 days
Trade names, patents and technology licences
    
Intangible Assets [Line Items]    
Gross 25.8 25.8
Accumulated Amortization 15.3 14.8
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period 9 years 5 months 12 days 9 years 9 months 18 days
Net 10.5 11.0
Covenants not to compete
    
Intangible Assets [Line Items]    
Gross 0.1 0.1
Accumulated Amortization 0 0
Net $ 0.1 $ 0.1
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period 2 years 11 months 0 days 3 years 5 months 0 days