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Pension Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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May 31, 2014 | May 31, 2013 | May 31, 2012
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |  |
Average compensation with accrued benefits vesting period | 5 years |  |
Matching contribution charged to income | $ 13.6 | $ 13.1 | $ 11.9
Pension Benefits, U.S. Plans |  |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |  |
Contribution to retirement plans in the next fiscal year | 53.1 |  |
Pension Benefits, Non-U.S. Plans |  |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |  |
Contribution to retirement plans in the next fiscal year | 6.3 |  |
Pension Plan, Defined Benefit |  |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |  |
Estimated benefits payable in the first year | 30.8 |  |
Estimated benefits payable in the second year | 32.0 |  |
Estimated benefits payable in the third year | 34.7 |  |
Estimated benefits payable in the fourth year | 36.5 |  |
Estimated benefits payable in the fifth year | 38.9 |  |
Estimated benefits payable in the years thereafter | $ 226.1 |  |

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- Definition Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit 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 (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit 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 (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit 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 (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit 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 (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit 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 (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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