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Revenue, Gross Profit, Gross Profit Margin and Operating Income (Loss) from Continuing Operations by Reportable Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Revenue $ 146,965 $ 108,974
Gross Profit $ 62,159 $ 46,094
Gross profit margin percentage 42.30% 42.30%
Operating Income (Loss) $ 17,227 $ 10,339
Photonics    
Segment Reporting Information [Line Items]    
Revenue 61,831 50,736
Gross Profit $ 29,555 $ 21,789
Gross profit margin percentage 47.80% 42.90%
Operating Income (Loss) $ 15,323 $ 8,207
Vision    
Segment Reporting Information [Line Items]    
Revenue 56,209 32,762
Gross Profit $ 19,721 $ 13,146
Gross profit margin percentage 35.10% 40.10%
Operating Income (Loss) $ 475 $ 1,525
Precision Motion    
Segment Reporting Information [Line Items]    
Revenue 28,925 25,476
Gross Profit $ 13,260 $ 11,518
Gross profit margin percentage 45.80% 45.20%
Operating Income (Loss) $ 8,607 $ 7,164
Unallocated Corporate and Shared Services    
Segment Reporting Information [Line Items]    
Gross Profit (377) (359)
Operating Income (Loss) $ (7,178) $ (6,557)