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Segment Information - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
	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 Segment	May 31, 2013	May 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments									2
Net Sales	$ 67,262,000	$ 61,996,000	$ 59,599,000	$ 58,548,000	$ 56,007,000	$ 51,055,000	$ 50,737,000	$ 49,729,000	$ 247,405,000	$ 207,528,000	$ 184,046,000
Foreign Operations
Segment Reporting Information [Line Items]
Net Sales									$ 96,111,000	$ 83,171,000	$ 76,672,000
Net Sales, percentage									38.80%	40.10%	41.70%
United States
Segment Reporting Information [Line Items]
Long lived assets percentage	95.00%				95.00%				95.00%	95.00%

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- Definition

Long Lived Assets Percentage

+ References

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- Definition

Sales Revenue Goods Net Percentages

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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

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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

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