Debt (Schedule of short-term debt) (Details) (USD $) In Millions, unless otherwise specified	Feb. 24, 2013	May 27, 2012
Short-term Debt [Line Items]
Notes payable	$ 682.7	$ 526.5
Commercial Paper [Member] \| U.S. Retail [Member]
Short-term Debt [Line Items]
Notes payable	596.7	412.0
Financial Institutions [Member]
Short-term Debt [Line Items]
Notes payable	$ 86.0	$ 114.5

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant