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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 28, 2012
reportable_segments
state
branch
Dec. 30, 2011
Dec. 31, 2010
Description of business [Abstract]        
Number of network branches operated by Company   691    
Number of states in which Company operates   50    
Segment reporting [Abstract]        
Number of reportable segments   1    
Percentage of revenue from international operations   3.50% 3.80% 3.80%
Fiscal year end [Abstract]        
Number of weeks in current fiscal year       P53W
Number of weeks in current quarter P14W      
Advertising costs        
Advertising expenses   $ 3.7 $ 3.6 $ 3.3
Accounts receivable and allowance for doubtful accounts [Abstract]        
Accounts receivable, allowance for doubtful accounts   $ 5.0 $ 5.8  
Shares outstanding [Abstract]        
Unvested restricted stock included in shares outstanding, value   0.6 0.7  
Buildings
       
Property and equipment [Abstract]        
Estimated useful life   40 years    
Minimum | Computers and software
       
Property and equipment [Abstract]        
Estimated useful life   3 years    
Minimum | Furniture and equipment
       
Property and equipment [Abstract]        
Estimated useful life   3 years    
Maximum | Computers and software
       
Property and equipment [Abstract]        
Estimated useful life   10 years    
Maximum | Furniture and equipment
       
Property and equipment [Abstract]        
Estimated useful life   10 years