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Concentrations (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Apparel Production [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk sourcing countries | 19 |
Footwear Production [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk sourcing countries | 5 |
Maximum [Member] |  |
Concentration Risk [Line Items] |  |
Remaining maturity of derivative contracts | 3 years |
Aggregate unrealized gain of derivative contracts with single counterparty | $ 2,000,000 |
United States [Member] | Credit Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 12.30% | 15.90%
Vietnam And China [Member] | Apparel [Member] | Supplier Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 64.00% |
China And Vietnam [Member] | Footwear [Member] | Supplier Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, geographic | substantially all |
Five Largest Apparel Factory Groups [Member] | Apparel [Member] | Supplier Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 29.00% |
Largest Apparel Factory Groups [Member] | Apparel [Member] | Supplier Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 10.00% |
Five Largest Footwear Factory Groups [Member] | Footwear [Member] | Supplier Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 75.00% |
Largest Footwear Factory Groups [Member] | Footwear [Member] | Supplier Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 34.00% |

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- Definition Description of risks that arise due to concentrations of operating facilities, revenues, assets, customers, vendors or the like in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures).. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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