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Concentrations of Risk (Narrative) (Details) - manufacturer	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Concentration Risk [Line Items]
Number of third-party manufacturers	110	116	110	116
Sales | Product Concentration Risk | Top 5 Customers
Concentration Risk [Line Items]
Concentration risk, percentage	40.80%	41.60%	42.00%	42.00%
Sales | Customer Concentration Risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	25.30%	21.10%	25.40%	20.90%
Sales | Customer Concentration Risk | Walgreens
Concentration Risk [Line Items]
Concentration risk, percentage	8.70%	10.70%	8.90%	10.50%
Sales | Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			79.50%	78.80%
Number of third-party manufacturers with long-term contracts			45	49
Accounts Receivable | Customer Concentration Risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage			24.90%
Accounts Receivable | Customer Concentration Risk | Walgreens
Concentration Risk [Line Items]
Concentration risk, percentage			8.30%

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- Definition

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
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&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=77997519&loc=d3e13537-108611

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