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Concentrations of Risk (Narrative) (Details) - manufacturer	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Concentration Risk [Line Items]
Number of third-party manufacturers	116
Sales | Product concentration risk | Top 5 customers
Concentration Risk [Line Items]
Concentration risk, percentage	41.20%	40.00%	41.90%
Sales | Customer concentration risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	23.80%	21.10%	20.20%
Sales | Supplier concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	73.60%	78.40%
Number of third-party manufacturers with long-term contracts	46	47
Accounts receivable | Customer concentration risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	26.10%

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Number of Third-party Manufacturers

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Number of Third-party Manufacturers with Long-term Contracts

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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.

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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.

+ 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
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

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-Paragraph 21
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