NET INCOME PER SHARE (Details) (USD $) In Millions, except Share data	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Basic net income per share:
Net income	$ 104.5	$ 93.2	$ 300.4	$ 234.8
Weighted average number of shares outstanding (in shares)	119.8	126.9	121.6	127.8
Basic net income per share (in dollars per share)	$ 0.87	$ 0.73	$ 2.47	$ 1.84
Diluted net income per share:
Net income	$ 104.5	$ 93.2	$ 300.4	$ 234.8
Weighted average number of shares outstanding (in shares)	119.8	126.9	121.6	127.8
Dilutive effect of stock options and restricted stock units (as determined by applying the treasury stock method) (in shares)	0.9	0.9	0.8	0.9
Weighted average number of shares and dilutive potential shares outstanding (in shares)	120.7	127.8	122.4	128.7
Diluted net income per share (in dollars per share)	$ 0.87	$ 0.73	$ 2.45	$ 1.82