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Increasing or Decreasing Current Health Care Cost Trend (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2017 | May 31, 2016
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 | $ 229 | $ 313
1% Increase in trend rate, postretirement cost | 9 | 11
1% Decrease in trend rate, accumulated benefit obligation | (201) | (272)
1% Decrease in trend rate, postretirement cost | (8) | (9)
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 | 6,410 | 5,552
1% Increase in trend rate, postretirement cost | 547 | 504
1% Decrease in trend rate, accumulated benefit obligation | (5,016) | (4,289)
1% Decrease in trend rate, postretirement cost | $ (406) | $ (383)

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- Definition Assumed Health Care Cost Trend Rates, Effect of One Percentage Point Change [Line Items] + References No definition available. + 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 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=65897934&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=65897934&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=65897934&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=65897934&loc=d3e1928-114920 + Details
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