Unaudited Quarterly Results (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 28, 2014	Nov. 22, 2013	Aug. 23, 2013	May 24, 2013	Feb. 22, 2013	Nov. 23, 2012	Aug. 24, 2012	May 25, 2012	Feb. 28, 2014	Feb. 22, 2013	Feb. 24, 2012
Unaudited Quarterly Results [Abstract]
Revenue	$ 779.4	$ 784.8	$ 757.6	$ 667.1	$ 721.4	$ 727.2	$ 744.9	$ 675.2	$ 2,988.9	$ 2,868.7	$ 2,749.5
Gross profit	248.4	242.8	244.3	209.7	216.0	225.9	228.1	196.0	945.2	866.0	809.7
Operating income (loss)	54.2	39.3	52.0	20.4	(45.2)	38.4	46.8	19.3	165.9	59.3	97.1
Net income	$ 23.9	$ 23.0	$ 27.6	$ 13.2	$ (27.5)	$ 23.6	$ 29.5	$ 13.2	$ 87.7	$ 38.8	$ 56.7
Earnings per share, basic	$ 0.19	$ 0.18	$ 0.22	$ 0.10	$ (0.22)	$ 0.19	$ 0.23	$ 0.10	$ 0.70	$ 0.30	$ 0.43
Earnings per share, diluted	$ 0.19	$ 0.18	$ 0.22	$ 0.10	$ (0.22)	$ 0.18	$ 0.23	$ 0.10	$ 0.69	$ 0.30	$ 0.43