Earnings Per Share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Equity [Abstract]
Net income	$ 467.9	$ 381.3	$ 368.0
Basic weighted average number of shares outstanding	79.5	79.9	80.2
Dilutive effect of share awards (in shares)	0.2	0.3	0.5
Diluted weighted average number of shares outstanding	79.7	80.2	80.7
Earnings per share - basic (usd per share)	$ 5.89	$ 4.77	$ 4.59
Earnings per share - diluted (usd per share)	$ 5.87	$ 4.75	$ 4.56