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Weighted-Average Actual Target Allocation of Plan Assets (Detail) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016 | May 31, 2015
--- | --- | --- | ---
Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 100.00% |  |
Actual Asset Allocation | $ 437,481 | $ 314,216 | $ 327,427
Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 100.00% |  |
Actual Asset Allocation | $ 179,928 | 169,464 | $ 176,437
Equity securities | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 55.00% |  |
Actual Asset Allocation | $ 295,200 | 234,700 |
Equity securities | Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 40.00% |  |
Actual Asset Allocation | $ 83,800 | 71,700 |
Fixed income securities | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 25.00% |  |
Actual Asset Allocation | $ 82,400 | 72,100 |
Fixed income securities | Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 41.00% |  |
Actual Asset Allocation | $ 65,900 | 67,400 |
Cash | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actual Asset Allocation | $ 59,700 | 7,100 |
Real Estate | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 20.00% |  |
Actual Asset Allocation | $ 200 | 300 |
Real Estate | Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 19.00% |  |
Actual Asset Allocation | $ 30,200 | $ 30,400 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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