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Fair Value Measurements - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2014 USD ($) | May 31, 2014 EUR (€) | May 31, 2014 Unsecured Senior Notes | May 31, 2014 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($) | May 31, 2013 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($) | May 31, 2014 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | May 31, 2013 Fair Value, Measurements, Recurring Cross-currency swap USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Foreign currency contracts, fair value of liability |  |  |  |  | $ 4,751,000 | $ 19,550,000 | $ 10,048,000
Debt, interest rate |  |  | 6.70% |  |  |  |
Debt, due date |  |  | Nov. 01, 2015 |  |  |  |
Effective euro fixed-rate borrowing | 5.31% |  |  |  |  |  |
Notional principal amount of cross-currency swap | 150,000,000 | 125,000,000 |  |  |  |  |
Foreign currency forward contract |  |  |  | 2,582,000 |  |  |
Increase in obligation due to current-year acquisitions | 17,300,000 |  |  |  |  |  |
Settlements of contingent obligations | $ 5,000,000 |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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