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Pension Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
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 | $ 14.9 | $ 13.6 | $ 13.1
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 | 32.0 |  |
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 | 5.7 |  |
Pension Plan, Defined Benefit |  |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |  |
Estimated benefits payable in the first year | 33.0 |  |
Estimated benefits payable in the second year | 36.3 |  |
Estimated benefits payable in the third year | 37.0 |  |
Estimated benefits payable in the fourth year | 40.6 |  |
Estimated benefits payable in the fifth year | 42.6 |  |
Estimated benefits payable in the years thereafter | $ 239.2 |  |

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- Definition Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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=35743120&loc=d3e1928-114920 + Details
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