Unaudited Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Feb. 28, 2020	Nov. 22, 2019	Aug. 23, 2019	May 24, 2019	Feb. 22, 2019	Nov. 23, 2018	Aug. 24, 2018	May 25, 2018	Feb. 28, 2020	Feb. 22, 2019	Feb. 23, 2018
Unaudited Quarterly Results [Abstract]
Gross profit	$ 307.2	$ 316.1	$ 333.5	$ 258.4	$ 283.1	$ 278.3	$ 288.6	$ 237.9	$ 1,215.2	$ 1,087.9	$ 1,005.2
Operating income (loss)	69.0	75.1	85.3	27.6	47.0	45.4	67.9	23.3	257.0	183.6	155.2
Net income	$ 66.5	$ 54.9	$ 60.5	$ 17.8	$ 22.6	$ 37.3	$ 49.1	$ 17.0	$ 199.7	$ 126.0	$ 80.7
Earnings per share, basic	$ 0.56	$ 0.46	$ 0.50	$ 0.15	$ 0.19	$ 0.31	$ 0.41	$ 0.14	$ 1.67	$ 1.06	$ 0.68
Earnings per share, diluted	$ 0.55	$ 0.46	$ 0.50	$ 0.15	$ 0.19	$ 0.31	$ 0.41	$ 0.14	$ 1.66	$ 1.05	$ 0.68
Revenues	$ 946.2	$ 955.2	$ 998.0	$ 824.3	$ 912.4	$ 901.0	$ 875.8	$ 754.0	$ 3,723.7	$ 3,443.2	$ 3,055.5