Earnings Per Share (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 23, 2012	Nov. 25, 2011	Nov. 23, 2012	Nov. 25, 2011
Earnings Per Share [Abstract]
Net income	$ 23.6	$ 22.4	$ 66.3	$ 41.8
Adjustment for earnings attributable to participating securities	0.3	0.4	0.9	0.7
Net income used in calculating earnings per share	$ 23.3	$ 22.0	$ 65.4	$ 41.1
Weighted-average common shares outstanding including participating securities (in millions)	126.9	131.3	127.6	132.8
Adjustment for participating securities (in millions)	(1.8)	(2.4)	(1.9)	(2.3)
Shares used in calculating basic earnings per share (in millions)	125.1	128.9	125.7	130.5
Effect of dilutive stock-based compensation (in millions)	1.2	0	1.1	0
Shares used in calculating diluted earnings per share (in millions)	126.3	128.9	126.8	130.5
Total common shares outstanding at period end (in millions)	125.2	127.4	125.2	127.4
Antidilutive options and performance units excluded from computation of diluted earnings per share (in millions)	0.8	4.1	0.8	4.1