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Correction of Prior Period Financial Statements (Details) (USD $) In Millions, unless otherwise specified	Nov. 23, 2012	Feb. 24, 2012
Correction Of Prior Period Financial Statement (Textual) [Abstract]
Deferred income taxes	$ 100.9	$ 120.0
Retained earnings	693.5	661.6
Adjustments for Error Correction [Member]
Correction Of Prior Period Financial Statement (Textual) [Abstract]
Deferred income taxes		12.5
Retained earnings		$ 12.5

Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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