Earnings Per Share, Basic And Diluted (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013
Earnings Per Share [Abstract]
Net income	$ 58.0	$ 67.4	$ 154.6	$ 159.2
Basic weighted average number of shares outstanding	79.9	80.3	79.9	80.6
Dilutive effect of share awards	0.3	0.4	0.3	0.4
Diluted weighted average number of shares outstanding	80.2	80.7	80.2	81.0
Earnings per share - basic	$ 0.73	$ 0.84	$ 1.93	$ 1.98
Earnings per share - diluted	$ 0.72	$ 0.84	$ 1.93	$ 1.97