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Description of business and significant accounting policies (Narrative) (Details) | 12 Months Ended
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Dec. 30, 2017 | Dec. 31, 2016
Basis Of Presentation Fiscal Year End And New Accounting Pronouncements Disclosure [Abstract] |  |
Year Founded | 1973 |
Finite-Lived Intangible Assets [Line Items] |  |
Fiscal Period Duration | 364 days | 364 days
Buildings [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 40 years |
Buildings [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 20 years |
Machinery and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 20 years |
Machinery and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 5 years |
Enterprise Software [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 5 years |
Enterprise Software [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 3 years |
Office Furniture and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 7 years |
Office Furniture and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 3 years |
Vehicles [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 7 years |
Vehicles [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life | 3 years |
Customer Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life | 25 years |
Customer Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life | 10 years |
Patents And Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life | 15 years |
Other Intangible Assets [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life | 15 years |
Other Intangible Assets [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life | 5 years |

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- Definition Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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