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Fair Value Measurements - Additional Information (Detail) |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2013 USD ($) | Nov. 30, 2013 EUR (€) | Nov. 30, 2013 Unsecured Senior Notes | Nov. 30, 2013 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | May 31, 2013 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | Nov. 30, 2013 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($) | May 31, 2013 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 liability |  |  |  | $ 18,668,000 | $ 10,048,000 |  | $ 4,751,000
Debt, interest rate |  |  | 6.70% |  |  |  |
Debt, due date |  |  | Nov. 01, 2015 |  |  |  |
Effective euro fixed-rate borrowing | 5.31% | 5.31% |  |  |  |  |
Notional principal amount of cross-currency swap | 150,000,000 | 125,000,000 |  |  |  |  |
Foreign currency forward contract |  |  |  |  |  | $ 2,620,000 |

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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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