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Weighted-Average Assumptions used to Determine Benefit Obligations and Net Periodic Postretirement Cost (Detail) | 12 Months Ended
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May 31, 2013 | May 31, 2012 | May 31, 2011
Postretirement Benefits, U.S. Plans |  |  |
Health Care Cost Trend Rates Assumptions [Line Items] |  |  |
Year-End Benefit Obligations, Discount rate | 3.95% | 3.75% |
Net Periodic Pension Cost, Discount rate | 3.75% | 4.75% | 5.75%
Year-End Benefit Obligations, Current healthcare cost trend rate | 7.54% | 7.70% |
Net Periodic Pension Cost, Healthcare cost trend rate | 7.70% | 7.87% | 8.04%
Year-End Benefit Obligations, Ultimate healthcare cost trend rate | 4.50% | 4.50% |
Net Periodic Pension Cost, Ultimate healthcare cost trend rate | 4.50% | 4.50% | 4.50%
Net Periodic Pension Cost, Year ultimate healthcare cost trend rate will be realized | 2029 | 2029 | 2029
Postretirement Benefits, Non-U.S. Plans |  |  |
Health Care Cost Trend Rates Assumptions [Line Items] |  |  |
Year-End Benefit Obligations, Discount rate | 4.50% | 4.75% |
Net Periodic Pension Cost, Discount rate | 4.75% | 5.75% | 5.75%
Year-End Benefit Obligations, Current healthcare cost trend rate | 6.43% | 6.92% |
Net Periodic Pension Cost, Healthcare cost trend rate | 6.92% | 7.00% | 7.40%
Year-End Benefit Obligations, Ultimate healthcare cost trend rate | 4.20% | 4.20% |
Net Periodic Pension Cost, Ultimate healthcare cost trend rate | 4.20% | 4.50% | 4.50%
Net Periodic Pension Cost, Year ultimate healthcare cost trend rate will be realized | 2030 | 2030 | 2030

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- Definition Defined Benefit Plan, Benefit Obligation, Current Health Care Cost Trend Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Net Periodic Postretirement Benefit Cost + References No definition available. + Details
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- Definition Health Care Cost Trend Rate used to Determine Net Period Benefit Cost + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -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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