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v3.10.0.1

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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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