Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified				6 Months Ended	3 Months Ended	6 Months Ended
Aug. 24, 2012	Feb. 29, 2012	Aug. 26, 2011	Aug. 24, 2012 Domestic Profit Sharing	Aug. 26, 2011 Domestic Profit Sharing	Aug. 24, 2012 Domestic Defined Contribution Plan	Aug. 26, 2011 Domestic Defined Contribution Plan	Aug. 24, 2012 Domestic Defined Contribution Plan	Aug. 26, 2011 Domestic Defined Contribution Plan
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the profit sharing plan				$ 3.4	$ 5.2	$ 1.3	$ 1.2	$ 2.6	$ 2.6
Liability for postretirement benefits other than pensions	27.7	24.8	27.9
Long-term liability for pension benefits	$ 75.6	$ 75.7	$ 60.0

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

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

-Publisher FASB

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 represents the noncurrent liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans).

+ References

+ Details