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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 25, 2015
USD ($)
segment
shares
Dec. 26, 2014
USD ($)
shares
Dec. 27, 2013
USD ($)
Property, Plant and Equipment [Line Items]      
Number of Reportable Segments | segment 2    
Advertising Expense $ 9,100 $ 6,200 $ 4,000
Allowance for doubtful accounts $ 5,902 $ 7,603  
Operating Leases, Maximum Period Afforded to Each Party to Cancel Lease Agreements 90 days    
Shares, Unvested Restricted Stock Included in Shares Outstanding, Shares | shares 700 677  
Minimum      
Property, Plant and Equipment [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 20.00%    
Operating Leases, Renewal Option Period 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Operating Leases, Renewal Option Period 5 years    
Building and Building Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Computers and software | Minimum      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Computers and software | Maximum      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Furniture and Equipment [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture and Equipment [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
52 Weeks [Member]      
Property, Plant and Equipment [Line Items]      
Fiscal Period, Number of Weeks in Current Fiscal Year 364 days    
Fiscal Period, Number of Weeks in Quarter 98 days    
53 Weeks [Member]      
Property, Plant and Equipment [Line Items]      
Fiscal Period, Number of Weeks in Current Fiscal Year 365 days    
Fiscal Period, Number of Weeks in Quarter 91 days    
PeopleScout [Member]      
Property, Plant and Equipment [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 11.00%    
hrX [Member]      
Property, Plant and Equipment [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 7.00%    
MSP [Member]      
Property, Plant and Equipment [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 15.00%