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Segment Information - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 USD ($) | Feb. 28, 2015 USD ($) | Nov. 30, 2014 USD ($) | Aug. 31, 2014 USD ($) | May. 31, 2014 USD ($) | Feb. 28, 2014 USD ($) | Nov. 30, 2013 USD ($) | Aug. 31, 2013 USD ($) | May. 31, 2015 USD ($) Segment | May. 31, 2014 USD ($) | May. 31, 2013 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  | 2 |  |
Net Sales | $ 78,611,000 | $ 68,409,000 | $ 68,455,000 | $ 67,599,000 | $ 67,262,000 | $ 61,996,000 | $ 59,599,000 | $ 58,548,000 | $ 283,074,000 | $ 247,405,000 | $ 207,528,000
Foreign Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 103,867,000 | $ 96,111,000 | $ 83,171,000
Net Sales, percentage |  |  |  |  |  |  |  |  | 36.70% | 38.80% | 40.10%
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long lived assets percentage | 95.00% |  |  |  | 95.00% |  |  |  | 95.00% | 95.00% |

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- Definition Sales Revenue Goods Net Percentages + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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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 + Details
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- Details
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