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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% |  |

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