Significant Accounting Policies (Schedule Of Useful Life for Property Plant and Equipment) (Details)	12 Months Ended
	Dec. 28, 2019
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	20 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	40 years
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	5 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	20 years
Enterprise software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	3 years
Enterprise software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	5 years
Office furniture and equipment [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
Vehicles [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