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Assets Acquired and Liabilities Assumed on Acquisition (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | May 31, 2013 | May 31, 2012
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Schedule of Business Acquisitions, Purchase Price Allocation [Line Items] |  |
Business acquisition cash acquired | $ 6.9 | $ 12.3

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- Definition The amount of cash and cash equivalents acquired in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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