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Weighted-Average Assumptions used to Determine Benefit Obligations and Net Periodic Postretirement Cost (Detail) - Postretirement Benefits | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Domestic |  |  |
Health Care Cost Trend Rates Assumptions [Line Items] |  |  |
Year-End Benefit Obligations, Discount rate | 2.44% | 3.44% |
Year-End Benefit Obligations, Current healthcare cost trend rate | 6.68% | 7.29% |
Year-End Benefit Obligations, Ultimate healthcare cost trend rate | 4.36% | 4.36% |
Year-End Benefit Obligation, Year ultimate healthcare cost trend rate will be realized | 2037 | 2037 |
Net Periodic Postretirement Cost, Discount rate | 3.44% | 4.03% | 3.61%
Net Periodic Postretirement Cost, Healthcare cost trend rate | 7.29% | 7.86% | 14.75%
Net Periodic Postretirement Cost, Ultimate healthcare cost trend rate | 4.36% | 4.36% | 4.36%
Net Periodic Postretirement Cost, Year ultimate healthcare cost trend rate will be realized | 2037 | 2037 | 2037
Non-U.S. Plans |  |  |
Health Care Cost Trend Rates Assumptions [Line Items] |  |  |
Year-End Benefit Obligations, Discount rate | 3.32% | 3.22% |
Year-End Benefit Obligations, Current healthcare cost trend rate | 5.73% | 5.77% |
Year-End Benefit Obligations, Ultimate healthcare cost trend rate | 3.70% | 3.70% |
Year-End Benefit Obligation, Year ultimate healthcare cost trend rate will be realized | 2040 | 2040 |
Net Periodic Postretirement Cost, Discount rate | 3.22% | 3.70% | 3.61%
Net Periodic Postretirement Cost, Healthcare cost trend rate | 5.77% | 6.02% | 5.85%
Net Periodic Postretirement Cost, Ultimate healthcare cost trend rate | 3.70% | 4.20% | 4.20%
Net Periodic Postretirement Cost, Year ultimate healthcare cost trend rate will be realized | 2040 | 2032 | 2030

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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