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Intangible assets (Summary of Changes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net, Opening	$ 172,059	$ 183,524
Amortization	(11,038)	(11,195)	$ (11,282)
Impairment		(456)
Foreign exchange	(46)	186
Finite-Lived Intangible Assets, Net, Ending	160,975	172,059	183,524
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net, Opening	171,902	183,258
Amortization	(10,948)	(11,086)
Impairment		(456)
Foreign exchange	(46)	186
Finite-Lived Intangible Assets, Net, Ending	160,908	171,902	183,258
Patents, Trademarks and Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net, Opening	157	266
Amortization	(90)	(109)
Impairment		0
Foreign exchange	0	0
Finite-Lived Intangible Assets, Net, Ending	$ 67	$ 157	$ 266

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 350
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-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 350
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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