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Long-Term Debt and Derivatives (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012 | May 31, 2012 | Jun. 02, 2012 Notes Due 2012 [Member] Senior Notes [Member] | Jun. 05, 2012 Notes Due 2022 [Member] Senior Notes [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commercial paper program availability | $ 300,000,000 |  | $ 300,000,000 |  |  |  |
Revolving credit facility, maximum borrowing capacity with accordion feature | 450,000,000 |  | 450,000,000 |  |  |  |
Revolving credit facility amount outstanding | 0 |  | 0 |  | 0 |  |
Repayments of Long-term Debt |  |  | 225,472,000 | 1,216,000 |  | 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 | $ 1,500,000 | $ 1,100,000 |  |  |

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- Definition Represents the increase in comprehensive income related to the amortization of an interest rate cash flow hedge. + 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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- 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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