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Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended					12 Months Ended
	Feb. 29, 2012	Aug. 31, 2011	Feb. 28, 2011	Jul. 31, 2008	Feb. 29, 2008	Dec. 27, 2011
Stockholders' Equity
Repurchase of common stock authorized by board of directors	$ 100.0		$ 50.0	$ 75.0	$ 25.0
Increase in amount of stock repurchase		50.0		50.0
Number of shares repurchased						59.1
Repurchase of common stock						3,972,100
Remaining repurchase authorized amount						$ 40.9

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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