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Description of business and significant accounting policies (Tables) | 12 Months Ended
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Dec. 30, 2017
Basis Of Presentation Fiscal Year End And New Accounting Pronouncements Disclosure [Abstract] |
Property, Plant and Equipment Useful Life Schedule [Table Text Block] |
Buildings |  | 20 - 40 years
Machinery and equipment |  | 5 - 20 years
Enterprise software |  | 3 - 5 years
Office furniture and equipment |  | 3 - 7 years
Vehicles |  | 3 - 7 years
Intangible Assets Useful Life Schedule [Table Text Block] |
Customer and other relationships |  | 10 - 25 years
Patents and trademarks |  | 15 years
Other |  | 5 - 15 years

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