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SUBSEQUENT EVENTS Subsequent event narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 25, 2016 | Mar. 27, 2015 | Jan. 01, 2017 | Dec. 25, 2015
Subsequent Event [Line Items] |  |  |  |
Revenues |  |  |  | $ 354,000
Goodwill before impairment | $ 337,604 |  |  | 314,705
Intangible Assets, Net (Excluding Goodwill) | 183,629 |  |  | $ 153,859
Customer Concentration Risk [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Revenues | $ 68,000 | $ 70,000 |  |
Concentration Risk, Percentage | 11.00% | 12.00% |  | 13.00%
Scenario, Forecast [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Decrease in Revenue, Due to Forecasted Transaction |  |  | $ 150,000 |
Staff Management SMX [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Goodwill before impairment | $ 42,700 |  |  |
Customer Relationships [Member] | Staff Management SMX [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 53,900 |  |  |

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