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Concentrations of Risk (Narrative) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 manufacturer | Dec. 31, 2015 manufacturer | Dec. 31, 2016 manufacturer customer | Dec. 31, 2015 manufacturer
Concentration Risk [Line Items] |  |  |  |
Number of third-party manufacturers | 112 | 101 | 112 | 101
Sales | Product Concentration Risk | Top 5 Customers |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 40.40% | 41.00% | 41.40% | 42.20%
Sales | Customer Concentration Risk | Walmart and Walgreen |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers exceeding concentration risk benchmark | customer |  |  | 2 |
Sales | Customer Concentration Risk | Walmart |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 20.40% | 20.20% | 20.70% | 19.90%
Sales | Customer Concentration Risk | Walgreens |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% | 9.50% | 10.30% | 9.60%
Sales | Supplier Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 78.50% | 79.80%
Number of third-party manufacturers with long-term contracts |  |  | 48 | 47
Accounts Receivable | Customer Concentration Risk | Walmart |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 25.70% |
Accounts Receivable | Customer Concentration Risk | Walgreens |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 10.50% |

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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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