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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, 2015 | May. 31, 2014 | May. 31, 2013
Postretirement Benefits, U.S. Plans |  |  |
Health Care Cost Trend Rates Assumptions [Line Items] |  |  |
Year-End Benefit Obligations, Discount rate | 3.95% | 4.00% |
Net Periodic Pension Cost, Discount rate | 4.00% | 3.95% | 3.75%
Year-End Benefit Obligations, Current healthcare cost trend rate | 11.34% | 12.28% |
Net Periodic Pension Cost, Healthcare cost trend rate | 12.28% | 7.54% | 7.70%
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 | 4.00% | 4.40% |
Net Periodic Pension Cost, Discount rate | 4.40% | 4.50% | 4.75%
Year-End Benefit Obligations, Current healthcare cost trend rate | 6.06% | 6.31% |
Net Periodic Pension Cost, Healthcare cost trend rate | 6.31% | 6.43% | 6.92%
Year-End Benefit Obligations, Ultimate healthcare cost trend rate | 4.20% | 4.20% |
Net Periodic Pension Cost, Ultimate healthcare cost trend rate | 4.20% | 4.20% | 4.20%
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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&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=35743120&loc=d3e1928-114920 + Details
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