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Significant Accounting Policies (Property, Plant and Equipment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Buildings |  |  |
Property, plant and equipment |  |  |
Useful life | 30 years |  |
Machinery and equipment |  |  |
Property, plant and equipment |  |  |
Useful life | 5 years |  |
Furniture and fixtures |  |  |
Property, plant and equipment |  |  |
Useful life | 5 years |  |
Computer equipment and software | Minimum |  |  |
Property, plant and equipment |  |  |
Useful life | 2 years |  |
Computer equipment and software | Maximum |  |  |
Property, plant and equipment |  |  |
Useful life | 7 years |  |
Selling, general and administrative | Retail stores |  |  |
Property, plant and equipment |  |  |
Impairment losses | $ 0.7 | $ 1.9 | $ 1.3
Restructuring charges |  |  |
Property, plant and equipment |  |  |
Loss on disposal of assets | 0.5 | 0.6 | 0.4
Restructuring charges | Retail stores |  |  |
Property, plant and equipment |  |  |
Impairment losses | $ 0.6 | $ 1.7 | $ 8.0

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + 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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