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Long-Term Debt, Derivatives and Letters of Credit - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2012 USD ($) | May 31, 2012 LIBOR | Aug. 31, 2013 Economic Hedge USD ($) | Aug. 31, 2013 Economic Hedge EUR (€) | Aug. 31, 2013 Standby Letters of Credit USD ($) | May 31, 2013 Standby Letters of Credit USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowing capacity | $ 150 |  |  |  |  |
Basis spread on LIBOR Rate |  | 1.75% |  |  |  |
Maturity period | July 2016 |  |  |  |  |
Debt issuance costs | 0.8 |  |  |  |  |
Commitment fees on unused borrowing capacity | 0.30% |  |  |  |  |
Outstanding letter of credit |  |  |  |  | 13.7 | 13.1
Borrowing under credit facility |  |  | $ 16.4 | € 12.3 |  |

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- Definition Maturity period of credit facility. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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