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Description of business and significant accounting policies (Narrative) (Details)
12 Months Ended
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