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Assets Acquired and Liabilities Assumed on Acquisition (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items] |  |
Business acquisition cash acquired | $ 2.8 | $ 0.3

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- Definition Schedule of Business Acquisitions, Purchase Price Allocation [Line Items] + References No definition available. + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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