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Segment and Geographic Information - Percentage of sales (Details) - Net sales revenue - Customer concentration risk | 12 Months Ended
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Feb. 28, 2018 | Feb. 28, 2017 | Feb. 29, 2016
Largest customer |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |
Percentage of net sales revenue | 15.00% | 16.00% | 18.00%
Largest customer | United States |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |
Percentage of sales from largest customer that were within the U.S. | 78.00% | 79.00% | 78.00%
Second largest customer | United States |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |
Percentage of sales from largest customer that were within the U.S. | 13.00% |  |

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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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611 + Details
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