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INCOME TAXES - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Income Tax Disclosures [Line Items]        
Effective tax rate 26.30% 38.40% 37.60%  
Statutory federal income tax rate 35.00%   35.00%  
Net operating loss and tax credits carry-forwards $ 1.1 $ 0.6    
Unrecognized tax benefits 2.0 1.9 1.7 1.6
Unrecognized tax benefits that would impact effective tax rate 1.3      
Income tax penalties accrued 0.2      
Interest on income tax penalties recognized 0.7      
Spartan Staffing Puerto Rico, LLC
        
Income Tax Disclosures [Line Items]        
Net operating loss carryforwards 2.7      
Labor Ready Southwest, Inc. | CALIFORNIA
        
Income Tax Disclosures [Line Items]        
Net operating loss and tax credits carry-forwards $ 1.0