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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. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 163,935	$ 165,745	$ 154,913	$ 149,193	$ 149,140	$ 152,794	$ 110,242	$ 102,857	$ 633,786	$ 515,033	$ 414,126
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues									374,433	316,506	258,171
Capital
Disaggregation of Revenue [Line Items]
Revenues									259,353	198,527	155,955
Papermaking Systems | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues									469,899	407,605	366,461
Wood Processing Systems | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues									151,366	95,053	36,850
North America
Disaggregation of Revenue [Line Items]
Revenues									305,618	238,483	203,063
Europe
Disaggregation of Revenue [Line Items]
Revenues									174,681	157,994	115,233
Asia
Disaggregation of Revenue [Line Items]
Revenues									109,688	78,443	62,703
Rest of World
Disaggregation of Revenue [Line Items]
Revenues									43,799	$ 40,113	$ 33,127
Point in Time
Disaggregation of Revenue [Line Items]
Revenues									577,506
Over Time
Disaggregation of Revenue [Line Items]
Revenues									$ 56,280

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
-Topic 606
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-Name Accounting Standards Codification
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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