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Summary of Significant Accounting Policies and Related Information - Receivables (Details) - Customer	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Receivables
Number of major customers	5	5
Customer concentration risk
Receivables
Number of major customers	3
Gross trade receivable | Customer concentration risk | Customer One
Receivables
Concentration risk percentage	17.00%
Gross trade receivable | Customer concentration risk | Customer Two
Receivables
Concentration risk percentage	12.00%
Gross trade receivable | Customer concentration risk | Customer Three
Receivables
Concentration risk percentage	12.00%
Gross trade receivable | Customer concentration risk | Five top customers
Receivables
Concentration risk percentage	48.00%
Top Supplier | Cost of goods sold manufactured by vendors | Supplier concentration risk
Receivables
Concentration risk percentage	11.00%
Top five suppliers | Cost of goods sold manufactured by vendors | Supplier concentration risk
Receivables
Concentration risk percentage	38.00%	34.00%	31.00%
Minimum
Receivables
Term allowed for sales returns	2 years
Maximum
Receivables
Term allowed for sales returns	5 years

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Contract With Customer, Refund Liability, Term

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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.

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