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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		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 195,811	$ 152,860	$ 368,274	$ 311,987
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues	124,975	97,261	243,082	202,358
Capital
Disaggregation of Revenue [Line Items]
Revenues	70,836	55,599	125,192	109,629
Point in Time
Disaggregation of Revenue [Line Items]
Revenues	175,479	129,797	329,896	265,889
Over Time
Disaggregation of Revenue [Line Items]
Revenues	20,332	23,063	38,378	46,098
North America
Disaggregation of Revenue [Line Items]
Revenues	106,767	88,718	201,859	182,541
Europe
Disaggregation of Revenue [Line Items]
Revenues	55,827	37,916	100,468	73,930
Asia
Disaggregation of Revenue [Line Items]
Revenues	24,729	16,237	46,542	32,145
Rest of World
Disaggregation of Revenue [Line Items]
Revenues	$ 8,488	$ 9,989	$ 19,405	$ 23,371

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