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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

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