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Employee Benefit Plans (Details) - Summary of weighted average actuarial assumptions utilized to benefit obligations | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Pension Plans [Member] | U.S. [Member] |  |  |
Weighted average assumptions used to determine benefit obligations: |  |  |
Discount rate | 2.40% | 3.50% | 3.80%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Weighted average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 3.50% | 3.80% | 3.90%
Expected short-term return on plan assets | 4.80% | 0.00% | 0.00%
Expected long-term return on plan assets | 0.00% | 4.80% | 5.40%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Pension Plans [Member] | U.K. [Member] |  |  |
Weighted average assumptions used to determine benefit obligations: |  |  |
Discount rate | 2.50% | 3.50% | 3.50%
Rate of compensation increase | 4.10% | 3.80% | 4.10%
Weighted average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 3.50% | 3.50% | 4.20%
Expected short-term return on plan assets | 0.00% | 0.00% | 0.00%
Expected long-term return on plan assets | 3.90% | 4.20% | 5.10%
Rate of compensation increase | 3.80% | 4.10% | 4.20%
Other Postretirement Benefits [Member] |  |  |
Weighted average assumptions used to determine benefit obligations: |  |  |
Discount rate | 3.70% | 3.70% | 3.80%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Weighted average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 3.70% | 3.80% | 4.00%
Expected short-term return on plan assets | 0.00% | 0.00% | 0.00%
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 Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Short-term Return on Assets + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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