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Employee Benefit Plans - Summary of weighted average actuarial assumptions utilized to benefit obligations (Details) | 12 Months Ended
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May 31, 2022 | May 31, 2021 | May 31, 2020
Pension Plans | U.K. |  |  |
Weighted average assumptions used to determine benefit obligations: |  |  |
Discount rate | 3.50% | 2.00% | 1.70%
Rate of compensation increase | 4.10% | 4.10% | 3.60%
Weighted average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 1.60% | 2.10% | 2.40%
Expected long-term return on plan assets | 3.10% | 2.20% | 3.10%
Rate of compensation increase | 4.10% | 3.60% | 4.10%
Other Postretirement Benefits | U.S. |  |  |
Weighted average assumptions used to determine benefit obligations: |  |  |
Discount rate | 4.30% | 2.50% | 2.70%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Weighted average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 1.70% | 1.50% | 3.20%
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00%
Rate of compensation increase | 0.00% | 0.00% | 0.00%

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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=123447040&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=123447040&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=123447040&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=123447040&loc=d3e2919-114920 + Details
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