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Nature of Operations and Summary of Significant Accounting Policies - Revenue Recognition by Product Line, Product Type, Geography and Revenue Recognition Method (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 172,463	$ 159,127
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues	118,107	105,098
Capital
Disaggregation of Revenue [Line Items]
Revenues	54,356	54,029
Point in Time
Disaggregation of Revenue [Line Items]
Revenues	154,417	136,092
Over Time
Disaggregation of Revenue [Line Items]
Revenues	18,046	23,035
North America
Disaggregation of Revenue [Line Items]
Revenues	95,092	93,823
Europe
Disaggregation of Revenue [Line Items]
Revenues	44,641	36,014
Asia
Disaggregation of Revenue [Line Items]
Revenues	21,813	15,908
Rest of World
Disaggregation of Revenue [Line Items]
Revenues	$ 10,917	$ 13,382

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