NET INCOME PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 29, 2012	Jul. 31, 2011	Jul. 29, 2012	Jul. 31, 2011
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 87,702	$ 66,729	$ 180,816	$ 124,396
Common stock dividends paid to holders of Series A convertible preferred stock	0	0	(209)	(314)
Allocation of income to Series A convertible preferred stock	(2,529)	(3,920)	(6,760)	(7,008)
Net income available to common stockholders for basic net income per common share	$ 85,173	$ 62,809	$ 173,847	$ 117,074
Weighted average common shares outstanding for basic net income per common share	70,403	67,129	69,471	66,964
Weighted average impact of dilutive securities	1,105	1,551	1,346	1,578
Weighted average impact of assumed convertible preferred stock conversion	2,095	4,189	2,785	4,189
Total shares for diluted net income per common share	73,603	72,869	73,602	72,731
Basic net income per common share (in dollars per share)	$ 1.21	$ 0.94	$ 2.50	$ 1.75
Diluted net income per common share (in dollars per share)	$ 1.19	$ 0.92	$ 2.46	$ 1.71
Weighted average antidilutive securities	466	396	360	320