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Industry Segment and Geographic Area Information Schedule of Depreciation, Amortization and Capital Expenditures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Segment Reporting Information [Line Items]      
Depreciation and amortization expense $ 105,000 $ 99,972 $ 105,364
Diagnostics [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization expense 31,204 25,339 29,728
Capital expenditures 11,262 8,556 6,854
Discovery & Analytical Solutions [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization expense 72,590 72,484 74,177
Capital expenditures 26,200 21,486 18,175
Corporate [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization expense 1,206 2,149 1,459
Capital expenditures 1,627 1,660 3,189
Continuing Operations [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization expense 105,000 99,972 105,364
Capital expenditures 39,089 31,702 28,218
Discontinued Operations [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization expense 929 6,266 6,643
Capital expenditures $ 182 $ 1,302 $ 1,414