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Segment and Geographic Information - Summary of Net Sales by Geographic Area (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2015 | Nov. 30, 2014 | Nov. 30, 2015 | Nov. 30, 2014
Net Sales |  |  |  |
Net sales | $ 89,234 | $ 92,149 | $ 172,937 | $ 179,480
Supply Agreement [Member] |  |  |  |
Net Sales |  |  |  |
Net sales | 738 | 1,107 | 1,406 | 2,290
Reportable Geographical Components [Member] | United States [Member] |  |  |  |
Net Sales |  |  |  |
Net sales | 70,651 | 72,058 | 139,021 | 140,438
Reportable Geographical Components [Member] | International [Member] |  |  |  |
Net Sales |  |  |  |
Net sales | 17,845 | 18,984 | 32,510 | 36,752
Reportable Geographical Components [Member] | Supply Agreement [Member] |  |  |  |
Net Sales |  |  |  |
Net sales | $ 738 | $ 1,107 | $ 1,406 | $ 2,290

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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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