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RESTRUCTURING AND ASSET IMPAIRMENTS - Severance and Retention Costs by Reportable Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Segment Reporting Information [Line Items]      
Total severance and transition costs $ 4,778 $ 17,879 $ 8,006
RMS      
Segment Reporting Information [Line Items]      
Total severance and transition costs 18,145    
Total reportable segments | RMS      
Segment Reporting Information [Line Items]      
Total severance and transition costs 291 759 3,171
Total reportable segments | DSA      
Segment Reporting Information [Line Items]      
Total severance and transition costs 1,604 17,114 1,068
Total reportable segments | Manufacturing      
Segment Reporting Information [Line Items]      
Total severance and transition costs 2,883 6 1,639
Unallocated corporate      
Segment Reporting Information [Line Items]      
Total severance and transition costs $ 0 $ 0 $ 2,128