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Retirement Plans - Schedule of Weighted Average Actuarial Assumptions Used to Determine the Benefit Obligations and Net Periodic Benefit Cost of our Plans (Details) | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019
Pension Plans [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Expected long-term rate of return on assets | 6.75% | 6.75% | 6.75%
Pension Plans [Member] | U.S. Plans [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Discount rate used to determine benefit obligation | 3.23% | 3.14% | 3.85%
Discount rate used to determine net periodic benefit cost | 3.14% | 3.85% | 4.27%
Rate of increase in future compensation levels used to determine benefit obligation | 5.06% | 5.17% | 5.10%
Rate of increase in future compensation levels used to determine net periodic benefit cost | 5.17% | 5.10% | 4.43%
Expected long-term rate of return on assets | 6.75% | 6.75% | 6.75%
Interest crediting rate used to determine net periodic benefit cost | 4.00% | 4.00% | 4.00%
Interest crediting rate used to determine benefit obligation | 4.00% | 4.00% | 4.00%
Pension Plans [Member] | International Pension Plans [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Discount rate used to determine benefit obligation | 1.83% | 1.79% | 1.92%
Discount rate used to determine net periodic benefit cost | 1.79% | 1.92% | 2.34%
Rate of increase in future compensation levels used to determine benefit obligation | 2.83% | 2.19% | 2.27%
Rate of increase in future compensation levels used to determine net periodic benefit cost | 2.19% | 2.43% | 2.22%
Expected long-term rate of return on assets | 2.71% | 3.26% | 3.12%
Interest crediting rate used to determine net periodic benefit cost | 2.00% | 2.20% | 2.20%
Interest crediting rate used to determine benefit obligation | 2.50% | 2.00% | 2.20%
Postretirement Healthcare Plans [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Discount rate used to determine benefit obligation | 2.81% | 2.95% | 3.70%
Discount rate used to determine net periodic benefit cost | 2.95% | 3.70% | 4.33%

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- Definition Weighted average interest crediting rate for cash balance pension plans and other plans with a specified crediting rate used to determine benefit obligation of deferred benefit plans. + References No definition available. + Details
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- Definition Weighted average interest crediting rate for cash balance pension plans and other plans with a specified crediting rate used to determine net periodic benefit cost of deferred benefit plans. + References No definition available. + Details
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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://www.xbrl.org/2003/role/disclosureRef -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 increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -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://www.xbrl.org/2003/role/disclosureRef -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 of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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