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Income Before Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 52,076 | $ 43,031 | $ 41,141
U.S. |  |  |
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | 45,156 | 37,568 | 37,407
Foreign |  |  |
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 6,920 | $ 5,463 | $ 3,734

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + 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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