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Intangible assets (Major Components) (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 191,326	$ 191,326
Accumulated amortization	58,009	49,063
Net book value	133,317	142,263
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	189,407	189,407
Accumulated amortization	56,090	47,169
Net book value	133,317	142,238
Patents, trademarks and other
Finite-Lived Intangible Assets [Line Items]
Cost	1,919	1,919
Accumulated amortization	1,919	1,894
Net book value	$ 0	$ 25

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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