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Concentrations of Risk (Narrative) (Details)	12 Months Ended
	Mar. 31, 2017 manufacturer customer	Mar. 31, 2016 manufacturer customer	Mar. 31, 2015 customer
Concentration Risk [Line Items]
Number of third-party manufacturers | manufacturer	113
Sales | Product concentration risk | Top 5 customers
Concentration Risk [Line Items]
Concentration risk, percentage	40.00%	41.90%	38.20%
Sales | Customer concentration risk
Concentration Risk [Line Items]
Number of customers exceeding concentration risk benchmark | customer		1	1
Sales | Customer concentration risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	21.10%	20.20%	18.10%
Number of customers exceeding concentration risk benchmark | customer	1
Sales | Supplier concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	78.40%	79.90%
Number of third-party manufacturers with long-term contracts | manufacturer	47	55
Accounts receivable | Customer concentration risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	33.10%

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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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Number of Customer Exceeding the Threshold

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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=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

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