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Employee Benefit Plans - Schedule of targeted weighted average asset allocations (Details) - U.K. - Pension Plans | May 31, 2022 | May 31, 2021
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Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Weighted average asset allocations | 100.00% | 100.00%
Targeted asset allocation | 100.00% |
Equity securities |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Weighted average asset allocations | 56.10% | 47.10%
Targeted asset allocation | 56.00% |
Cash and cash equivalents |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Weighted average asset allocations | 1.10% | 2.30%
Targeted asset allocation | 1.00% |
Liability-driven instruments |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Weighted average asset allocations | 23.20% | 31.80%
Targeted asset allocation | 23.00% |
Real estate |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Weighted average asset allocations | 5.70% | 4.20%
Targeted asset allocation | 6.00% |
Other |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Weighted average asset allocations | 13.90% | 14.60%
Targeted asset allocation | 14.00% |

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