Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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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=35744584&loc=d3e7008-128479

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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))

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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

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

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- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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No definition available.

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- Definition

Cash outflow representing an adjustment to the purchase price of a previous acquisition.

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No definition available.

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Fair Value Measurements - Additional Information (Detail)	9 Months Ended		9 Months Ended
	Feb. 28, 2015 USD ($)	Feb. 28, 2015 EUR (€)	Feb. 28, 2015 Unsecured Senior Notes	Feb. 28, 2015 Fair Value, Measurements, Recurring Cross-currency swap USD ($)	May 31, 2014 Fair Value, Measurements, Recurring Cross-currency swap USD ($)	Feb. 28, 2015 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($)	May 31, 2014 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts, fair value of asset				$ 11,600,000			$ 2,582,000
Debt, interest rate			6.70%
Debt, due date			Nov. 01, 2015
Effective euro fixed-rate borrowing	5.31%us-gaap_DerivativeFixedInterestRate
Notional principal amount of cross-currency swap	150,000,000invest_DerivativeNotionalAmount	125,000,000invest_DerivativeNotionalAmount
Foreign currency contracts, fair value of liability				(11,622,000)	19,550,000	5,559,000
Reversal for contingent earn out targets	(19,180,000)
Settlements of contingent consideration obligations	$ 24,800,000us-gaap_PaymentsForPreviousAcquisition