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Concentrations of Risk (Details) | 12 Months Ended
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Mar. 31, 2016 brand manufacturer customer | Mar. 31, 2015 manufacturer customer | Mar. 31, 2014 customer
Concentration Risk [Line Items] |  |  |
Number of third-party manufacturers | manufacturer | 119 |  |
Sales | Product Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 41.90% | 38.20% | 38.30%
Number of highest selling brands comprising group against which concentration risk is measured | brand | 5 |  |
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 | 20.20% | 18.10% | 19.50%
Number of customers exceeding concentration risk benchmark | customer | 1 |  |
Sales | Customer Concentration Risk | Next largest customer |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 9.60% |  |
Sales | Supplier Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 79.90% | 82.90% |
Number of third-party manufacturers with long-term contracts | manufacturer | 55 | 44 |
Accounts Receivable | Customer Concentration Risk | Walmart |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 24.70% |  |
Accounts Receivable | Customer Concentration Risk | Walgreens |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 10.40% |  |

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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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