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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		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 199,789	$ 154,610	$ 568,063	$ 466,597
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues	131,225	102,729	374,307	305,087
Capital
Disaggregation of Revenue [Line Items]
Revenues	68,564	51,881	193,756	161,510
Point in Time
Disaggregation of Revenue [Line Items]
Revenues	181,407	137,679	511,303	403,568
Over Time
Disaggregation of Revenue [Line Items]
Revenues	18,382	16,931	56,760	63,029
North America
Disaggregation of Revenue [Line Items]
Revenues	105,384	87,366	307,243	269,907
Europe
Disaggregation of Revenue [Line Items]
Revenues	58,813	38,951	159,281	112,881
Asia
Disaggregation of Revenue [Line Items]
Revenues	25,504	18,847	72,046	50,992
Rest of world
Disaggregation of Revenue [Line Items]
Revenues	$ 10,088	$ 9,446	$ 29,493	$ 32,817

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