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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 30, 2017
Commitments And Contingencies Disclosure [Abstract] |
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] | Minimum commitments under operating leases, principally for processing facilities, warehouse and distribution facilities, and equipment for the next five fiscal years and thereafter are as follows:
|  |  |  | $
2018 | 19,048
2019 | 15,820
2020 | 13,250
2021 | 8,902
2022 | 7,011
Thereafter | 7,868
|  |  |  | 71,899

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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