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Pension Plans - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Feb. 28, 2017 | May 31, 2016
Pension Benefits, U.S. Plans |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contribution to retirement plans in the next fiscal year |  | $ 54.1
Contribution to retirement plans in the current remaining fiscal year | $ 54.1 |
Pension Benefits, Non-U.S. Plans |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contribution to retirement plans in the next fiscal year |  | $ 6.0
Contribution to retirement plans in the current remaining fiscal year | $ 6.0 |

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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