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INCOME TAXES - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Dec. 25, 2009
Income Tax Disclosures [Line Items]        
Effective tax rate 38.40% 37.60% 32.00%  
Income tax expense based on statutory rate 35.00% 35.00% 35.00%  
Deferred taxes related to foreign currency translation     $ 0.1  
Unrecognized tax benefits 1.9 1.7 1.6 1.8
Unrecognized tax benefits that would impact effective tax rate 1.2      
Interest accrued on unrecognized tax benefits 0.1      
Income tax penalties recognized 0.2      
Interest on income tax penalties recognized 0.7      
Spartan Staffing Puerto Rico, LLC
        
Income Tax Disclosures [Line Items]        
Net operating loss carry-forwards $ 2.8