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Segment Information - Additional Information (Detail)	3 Months Ended								12 Months Ended
	May 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Nov. 30, 2016 USD ($)	Aug. 31, 2016 USD ($)	May 31, 2016 USD ($)	Feb. 29, 2016 USD ($)	Nov. 30, 2015 USD ($)	Aug. 31, 2015 USD ($)	May 31, 2017 USD ($) Segment	May 31, 2016 USD ($)	May 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment									2
Net Sales	$ 98,847,000	$ 88,385,000	$ 90,717,000	$ 83,645,000	$ 90,080,000	$ 76,725,000	$ 79,610,000	$ 74,860,000	$ 361,594,000	$ 321,275,000	$ 283,074,000
Foreign Operations
Segment Reporting Information [Line Items]
Net Sales									$ 129,322,000	$ 107,680,000	$ 103,867,000
Net Sales, percentage									35.80%	33.50%	36.70%
United States
Segment Reporting Information [Line Items]
Long lived assets percentage	76.00%				89.00%				76.00%	89.00%

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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.

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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=63488584&loc=d3e20235-122688

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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