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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