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Long-Term Debt and Derivatives (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended
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May 31, 2012 | May 31, 2011 | May 31, 2010 | May 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member] | May 31, 2011 Accumulated Other Comprehensive Income (Loss) [Member] | May 31, 2010 Accumulated Other Comprehensive Income (Loss) [Member] | May 31, 2012 Unsecured Term Notes [Member] | May 18, 2011 Notes Due 2016 [Member] Senior Notes [Member] | May 18, 2011 Notes Due 2021 [Member] Senior Notes [Member] | Jun. 02, 2012 Repayment of Debt [Member] Notes Due 2012 [Member] Senior Notes [Member] | Jun. 05, 2012 Issuance of Debt [Member] Notes Due 2012 [Member] Senior Notes [Member] | Jun. 05, 2012 Issuance of Debt [Member] Notes Due 2022 [Member] Senior Notes [Member]
Debt, Derivatives and Hedging Activities |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  | 5.10% |  |  |  |  |
Letters of credit outstanding, amount | $ 85,700,000 | $ 82,700,000 |  |  |  |  |  |  |  |  |  |
Maturities of long term debt, next twelve months | 225,600,000 |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt, year two | 8,200,000 |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt, year three | 500,000 |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt, year four | 200,000 |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt, year five | 250,200,000 |  |  |  |  |  |  |  |  |  |  |
Interest paid | 62,300,000 | 49,200,000 | 48,600,000 |  |  |  |  |  |  |  |  |
Commercial paper program availability | 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity with accordion feature | 450,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt to EBITDA Ratio Covenant Requirement | 3.5 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 250,000,000 | 250,000,000 |  |  |
Stated interest rate percentage on long term debt |  |  |  |  |  |  |  | 2.85% | 4.30% |  | 6.00% | 3.25%
Proceeds from issuance of debt | 0 | 1,002,281,000 | 0 |  |  |  |  |  |  |  |  | 250,000,000
Amortization of interest rate lock agreements | 1,508,000 | 767,000 | 767,000 | 1,508,000 | 767,000 | 767,000 |  |  |  |  |  |
Payments on long term debt | 1,323,000 | 502,208,000 | 603,000 |  |  |  |  |  |  | 225,000,000 |  |
Interest rate lock agreement charges | 5,800,000 |  |  |  |  |  |  |  |  |  |  |
Current accrued liabilities |  | 900,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives | $ (100,000) | $ (300,000) |  |  |  |  |  |  |  |  |  |

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- Definition Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -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 -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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