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Long-Term Debt, Derivatives and Letters of Credit - Additional Information (Detail) In Millions, unless otherwise specified | 9 Months Ended |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2013 USD ($) | Feb. 28, 2013 Economic Hedge USD ($) | Feb. 28, 2013 Economic Hedge EUR (€) | Feb. 28, 2013 Line of Credit | Feb. 28, 2013 Standby Letters of Credit USD ($) | May 31, 2012 Standby Letters of Credit USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowing capacity | $ 150 |  |  |  |  |
Interest based on variable euro dollar rate option |  |  |  | LIBOR plus 1.75% margin |  |
Basis spread on LIBOR Rate |  |  |  | 1.75% |  |
Maturity period |  |  |  | July 2016 |  |
Debt issuance costs | 0.8 |  |  |  |  |
Borrowing under credit facility |  | 16.1 | 12.3 |  |  |
Outstanding letter of credit |  |  |  |  | $ 15.3 | $ 13.5

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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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