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INCOME TAXES (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Aug. 02, 2014
May 03, 2014
Jul. 27, 2013
Valuation Allowance [Line Items]      
Deferred Federal and State income tax expense (benefit)   $ 31.7  
Federal tax expense (benefit) (8.1)    
State tax expense (benefit) (2.7)    
Research tax credit carryforwards 0.6    
Income tax expense 7.0   1.3
Effective income tax rate 24.60%   8.70%
Unrecognized tax benefits, income tax penalties and interest accrued 0.1    
Total unrecognized tax benefit 0.7    
Change in unrecognized tax benefits 0    
Malta | Investment Tax Credit Carryforward
      
Valuation Allowance [Line Items]      
Investment tax credit on qualified expenditures, percent 30.00%    
Unused credits 22.9    
Valuation allowance 9.3    
Federal
      
Valuation Allowance [Line Items]      
Operating loss carryforwards 25.0    
State
      
Valuation Allowance [Line Items]      
Operating loss carryforwards 93.0    
Foreign
      
Valuation Allowance [Line Items]      
Operating loss carryforwards 11.0    
Domestic federal and state
      
Valuation Allowance [Line Items]      
Valuation allowances against deferred tax assets $ 2.6 $ 2.6