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Sales by Category - Breakdown of the percentage of total sales by each category (Details) (Total sales, Customer concentration risk) | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Product Information [Line Items] |  |  |
Percentage products purchased from suppliers | 100.00% | 100.00% | 100.00%
Non-prescription medications and supplies |  |  |
Product Information [Line Items] |  |  |
Percentage products purchased from suppliers | 55.00% | 59.00% | 59.00%
Prescription medications |  |  |
Product Information [Line Items] |  |  |
Percentage products purchased from suppliers | 44.00% | 40.00% | 40.00%
Shipping and handling charges and other |  |  |
Product Information [Line Items] |  |  |
Percentage products purchased from suppliers | 1.00% | 1.00% | 1.00%

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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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: 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=6927468&loc=d3e6404-108592 Reference 3: 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=28364263&loc=d3e13531-108611 Reference 4: 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=6927468&loc=d3e6351-108592 + Details
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- Details
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