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Concentrations of Risk (Narrative) (Details) | 12 Months Ended
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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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- 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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