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Nature of Operations and Summary of Significant Accounting Policies - Revenue Recognition by Product Type, Geography and Revenue Recognition Method (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 182,659	$ 173,504	$ 177,165	$ 171,316	$ 163,935	$ 165,745	$ 154,913	$ 149,193	$ 704,644	$ 633,786	$ 515,033
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues									440,699	374,433	316,506
Capital
Disaggregation of Revenue [Line Items]
Revenues									263,945	259,353	198,527
North America
Disaggregation of Revenue [Line Items]
Revenues									386,952	305,618	238,483
Europe
Disaggregation of Revenue [Line Items]
Revenues									180,888	174,681	157,994
Asia
Disaggregation of Revenue [Line Items]
Revenues									84,705	109,688	78,443
Rest of World
Disaggregation of Revenue [Line Items]
Revenues									52,099	43,799	$ 40,113
Point in Time
Disaggregation of Revenue [Line Items]
Revenues									611,528	577,506
Over Time
Disaggregation of Revenue [Line Items]
Revenues									$ 93,116	$ 56,280

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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