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Increasing or Decreasing Current Health Care Cost Trend (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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May 31, 2014 | May 31, 2013
Postretirement Benefits, U.S. Plans |  |
Assumed Health Care Cost Trend Rates, Effect of One Percentage Point Change [Line Items] |  |
1% Increase in trend rate, accumulated benefit obligation | $ 239 | $ 296
1% Increase in trend rate, postretirement cost | 11 | 15
1% Decrease in trend rate, accumulated benefit obligation | (209) | (265)
1% Decrease in trend rate, postretirement cost | (10) | (13)
Postretirement Benefits, Non-U.S. Plans |  |
Assumed Health Care Cost Trend Rates, Effect of One Percentage Point Change [Line Items] |  |
1% Increase in trend rate, accumulated benefit obligation | 6,502 | 9,080
1% Increase in trend rate, postretirement cost | 727 | 647
1% Decrease in trend rate, accumulated benefit obligation | (5,011) | (3,802)
1% Decrease in trend rate, postretirement cost | $ (534) | $ (481)

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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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