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Summary of Significant Accounting Policies and Related Information - Receivables (Details) | 12 Months Ended
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Feb. 28, 2018 customer item | Feb. 28, 2017 customer
Receivables |  |
Number of receivables valuation reserves | item | 2 |
Number of major customers | 5 | 5
Customer concentration risk |  |
Receivables |  |
Number of major customers | 2 |
Gross trade receivable | Customer concentration risk | Two major customers |  |
Receivables |  |
Concentration risk percentage | 19.00% | 11.00%
Gross trade receivable | Customer concentration risk | Five top customers |  |
Receivables |  |
Concentration risk percentage | 48.00% | 44.00%

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- Definition Represents the number of receivable valuation reserves. + References No definition available. + 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=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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