Revenues - Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 29, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 463,526	$ 500,140
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	212,213	207,083
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	251,313	293,057
Products
Disaggregation of Revenue [Line Items]
Revenues	444,316	478,196
Products \| Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	212,213	207,083
Products \| Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	232,103	271,113
Support & Services
Disaggregation of Revenue [Line Items]
Revenues	19,210	21,944
Support & Services \| Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	0	0
Support & Services \| Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 19,210	$ 21,944

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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+ Details