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RESTRUCTURING AND ASSET IMPAIRMENTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Restructuring Cost and Reserve [Line Items]        
Severance and retention costs liability $ 3,680 $ 2,969 $ 2,666 $ 2,782
Consolidation of Safety Assessment Facilities in Ireland        
Restructuring Cost and Reserve [Line Items]        
Asset impairments 9,400      
Consolidation of Research Model Operations in U.S., Japan and Europe        
Restructuring Cost and Reserve [Line Items]        
Asset impairments   1,800 2,200  
Accelerated depreciation     4,300  
Gain on disposition of European facility     $ 1,000  
Accrued Compensation        
Restructuring Cost and Reserve [Line Items]        
Severance and retention costs liability 3,600 2,600    
Other long-term liabilities        
Restructuring Cost and Reserve [Line Items]        
Severance and retention costs liability $ 100 $ 300