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Segments and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2014 | May 31, 2013 | May 31, 2012
Net Sales by Geography |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 94,065 | $ 88,195 | $ 88,616 | $ 83,579 | $ 90,042 | $ 81,571 | $ 87,007 | $ 83,406 | $ 354,455 | $ 342,026 | $ 221,787
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales by Geography |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 280,191 | 266,338 | 188,187
International [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales by Geography |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 68,219 | 67,190 | 33,600
Supply Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales by Geography |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 6,045 | $ 8,498 | $ 0

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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