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Summary of Significant Accounting Policies and Related Information - Receivables (Details)	12 Months Ended
	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 major customers.

+ References

No definition available.

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- Definition

Represents the number of receivable valuation reserves.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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-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

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