Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Feb. 24, 2017	Nov. 25, 2016	Aug. 26, 2016	May 27, 2016	Feb. 26, 2016	Nov. 27, 2015	Aug. 28, 2015	May 29, 2015	Feb. 24, 2017	Feb. 26, 2016	Feb. 27, 2015
Earnings Per Share [Abstract]
Net income	$ 25.8	$ 41.2	$ 38.2	$ 19.4	$ 77.5	$ 35.6	$ 37.2	$ 20.0	$ 124.6	$ 170.3	$ 86.1
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									(2.4)	(3.4)	(1.6)
Net income used in calculating earnings per share									$ 122.2	$ 166.9	$ 84.5
Weighted-average common shares outstanding including participating securities (in millions)									120.7	124.3	124.4
Adjustment for participating securities (in millions)									(2.3)	(2.5)	(2.3)
Shares used in calculating basic earnings per share (in millions)									118.4	121.8	122.1
Effect of dilutive stock-based compensation (in millions)									0.5	1.0	1.6
Shares used in calculating diluted earnings per share (in millions)									118.9	122.8	123.7
Earnings per share, basic	$ 0.22	$ 0.34	$ 0.32	$ 0.16	$ 0.63	$ 0.29	$ 0.30	$ 0.16	$ 1.03	$ 1.37	$ 0.69
Earnings per share, diluted	$ 0.21	$ 0.34	$ 0.31	$ 0.16	$ 0.62	$ 0.28	$ 0.30	$ 0.16	$ 1.03	$ 1.36	$ 0.68
Total common shares outstanding at period end (in millions)	117.3				119.4				117.3	119.4	121.5
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									0.3	0.0	0.0