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Goodwill and intangible assets (Major Components - Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 213,095 | $ 214,513 |
Accumulated amortization | 41,036 | 30,989 |
Net book value | 172,059 | 183,524 | $ 195,008
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 211,176 | 212,172 |
Accumulated amortization | 39,274 | 28,914 |
Net book value | 171,902 | 183,258 | 194,633
Patents, Trademarks and Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 1,919 | 2,341 |
Accumulated amortization | 1,762 | 2,075 |
Net book value | $ 157 | $ 266 | $ 375

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- 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/presentationRef -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 + Details
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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/presentationRef -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 + Details
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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/presentationRef -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 + Details
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