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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, 2017 | May 31, 2016 | May 31, 2015
U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Discount rate used to determine benefit obligation | 4.08% | 4.13% | 4.42%
Discount rate used to determine net periodic benefit cost | 4.13% | 4.42% | 4.60%
Rate of increase in future compensation levels used to determine benefit obligation | 4.47% | 4.46% | 4.62%
Rate of increase in future compensation levels used to determine net periodic benefit cost | 4.46% | 4.62% | 4.56%
Expected long-term rate of return on assets | 6.50% | 6.50% | 7.75%
U.S. Pension Plans [Member] | Segment [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Expected long-term rate of return on assets | 6.50% | 6.50% | 6.50%
International Pension Plans [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Discount rate used to determine benefit obligation | 2.43% | 2.46% | 2.95%
Discount rate used to determine net periodic benefit cost | 2.46% | 2.95% | 3.57%
Rate of increase in future compensation levels used to determine benefit obligation | 2.42% | 2.82% | 3.19%
Rate of increase in future compensation levels used to determine net periodic benefit cost | 2.82% | 3.19% | 3.31%
International Pension Plans [Member] | Segment [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Expected long-term rate of return on assets | 3.18% | 3.68% | 5.13%
Postretirement Healthcare Plans [Member] |  |  |
Defined Benefit Plan Assumptions Used In Calculations [Abstract] |  |  |
Discount rate used to determine benefit obligation | 4.32% | 4.43% | 4.60%
Discount rate used to determine net periodic benefit cost | 4.43% | 4.62% | 4.70%

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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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