Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Nov. 24, 2012	Feb. 25, 2012
Valuation of the Company's financial assets measured at fair value on a recurring basis by input level:
Long term - available-for-sale securities: Auction rate securities	$ 49.0	$ 73.7
Long term - trading securities: Nonqualified deferred compensation plan assets	25.6	22.1
Auction Rate Securities
Valuation of the Company's financial assets measured at fair value on a recurring basis by input level:
Long term - available-for-sale securities: Auction rate securities	49.0	73.7
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Valuation of the Company's financial assets measured at fair value on a recurring basis by input level:
Long term - trading securities: Nonqualified deferred compensation plan assets	25.6
Total	25.6
Recurring \| Significant Unobservable Inputs (Level 3)
Valuation of the Company's financial assets measured at fair value on a recurring basis by input level:
Total	49.0
Recurring \| Significant Unobservable Inputs (Level 3) \| Auction Rate Securities
Valuation of the Company's financial assets measured at fair value on a recurring basis by input level:
Long term - available-for-sale securities: Auction rate securities	49.0
Recurring \| Total
Valuation of the Company's financial assets measured at fair value on a recurring basis by input level:
Long term - trading securities: Nonqualified deferred compensation plan assets	25.6
Total	74.6
Recurring \| Total \| Auction Rate Securities
Valuation of the Company's financial assets measured at fair value on a recurring basis by input level:
Long term - available-for-sale securities: Auction rate securities	$ 49.0

Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer.

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

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-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

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-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

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

-Publisher FASB

-Name Accounting Standards Codification

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-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 86-40

-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 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 17

-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.

+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References+ Details