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Long-Term Debt and Derivatives (Details) (USD $) | 3 Months Ended | 0 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2012 | Aug. 31, 2011 | Jun. 02, 2012 Notes Due 2012 [Member] Repayment of Debt [Member] Senior Notes [Member] | Jun. 05, 2012 Notes Due 2012 [Member] Issuance of Debt [Member] Senior Notes [Member] | Jun. 05, 2012 Notes Due 2022 [Member] Issuance of Debt [Member] Senior Notes [Member]
Line of Credit Facility [Line Items] |  |  |  |  |
Commercial paper program availability | $ 300,000,000 |  |  |  |
Revolving credit facility, maximum borrowing capacity with accordion feature | 450,000,000 |  |  |  |
Repayments of Long-term Debt | 225,154,000 | 444,000 | 225,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.00% | 3.25%
Proceeds from Issuance of Long-term Debt | 250,000,000 | 0 |  |  | 250,000,000
Other Comprehensive Income Increase from Amortization of Interest Rate Cash Flow Hedge | $ 500,000 | $ 400,000 |  |  |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + Details
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