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Segment Information - Additional Information (Detail)	3 Months Ended								12 Months Ended
	May 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	May 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Nov. 30, 2016 USD ($)	Aug. 31, 2016 USD ($)	May 31, 2018 USD ($) Segment	May 31, 2017 USD ($)	May 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment									2
Net Sales	$ 109,287,000	$ 95,892,000	$ 101,817,000	$ 95,256,000	$ 98,847,000	$ 88,385,000	$ 90,717,000	$ 83,645,000	$ 402,252,000	$ 361,594,000	$ 321,275,000
Foreign Operations
Segment Reporting Information [Line Items]
Net Sales									$ 151,262,000	$ 129,322,000	$ 107,680,000
Net Sales, percentage									37.60%	35.80%	33.50%
United States
Segment Reporting Information [Line Items]
Long lived assets percentage	75.00%				76.00%				75.00%	76.00%

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Long lived assets percentage.

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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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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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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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