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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. 29, 2019
Mar. 30, 2018
Segment Reporting Information [Line Items]    
Revenue $ 157,186 $ 146,965
Gross Profit $ 66,289 $ 62,159
Gross profit margin percentage 42.20% 42.30%
Operating Income (Loss) $ 14,393 $ 17,227
Unallocated Corporate and Shared Services    
Segment Reporting Information [Line Items]    
Gross Profit (519) (377)
Operating Income (Loss) (8,109) (7,178)
Photonics    
Segment Reporting Information [Line Items]    
Revenue $ 59,225 $ 61,831
Gross profit margin percentage 46.10% 47.80%
Photonics | Operating Segments    
Segment Reporting Information [Line Items]    
Gross Profit $ 27,314 $ 29,555
Operating Income (Loss) 12,310 15,323
Vision    
Segment Reporting Information [Line Items]    
Revenue $ 65,936 $ 56,209
Gross profit margin percentage 39.40% 35.10%
Vision | Operating Segments    
Segment Reporting Information [Line Items]    
Gross Profit $ 25,973 $ 19,721
Operating Income (Loss) 4,557 475
Precision Motion    
Segment Reporting Information [Line Items]    
Revenue $ 32,025 $ 28,925
Gross profit margin percentage 42.20% 45.80%
Precision Motion | Operating Segments    
Segment Reporting Information [Line Items]    
Gross Profit $ 13,521 $ 13,260
Operating Income (Loss) $ 5,635 $ 8,607