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Income Before Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 66,673 | $ 55,513 | $ 52,076
U.S. |  |  |
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | 55,171 | 50,662 | 45,156
Foreign |  |  |
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 11,502 | $ 4,851 | $ 6,920

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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