Earnings Per Share, Basic And Diluted (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	May 03, 2014	May 04, 2013
Earnings Per Share [Abstract]
Net income	$ 96.6	$ 91.8
Basic weighted average number of shares outstanding	79.9	80.8
Dilutive effect of share awards	0.4	0.5
Diluted weighted average number of shares outstanding	80.3	81.3
Earnings per share - basic	$ 1.21	$ 1.14
Earnings per share - diluted	$ 1.20	$ 1.13