NET INCOME (LOSS) PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 66,729	$ (70,624)	$ 124,396	$ (98,237)
Common stock dividends paid to holders of Series A convertible preferred stock	0	(157)	(314)	(157)
Allocation of income to Series A convertible preferred stock	(3,920)	0	(7,008)	0
Net income (loss) available to common stockholders for basic net income (loss) per common share	$ 62,809	$ (70,781)	$ 117,074	$ (98,394)
Weighted average common shares outstanding for basic net income (loss) per common share	67,129	65,875	66,964	59,077
Weighted average impact of dilutive securities	1,551	0	1,578	0
Weighted average impact of assumed convertible preferred stock conversion	4,189	0	4,189	0
Total shares for diluted net income (loss) per common share	72,869	65,875	72,731	59,077
Basic net income (loss) per common share	$ 0.94	$ (1.07)	$ 1.75	$ (1.67)
Diluted net income (loss) per common share	$ 0.92	$ (1.07)	$ 1.71	$ (1.67)
Weighted average antidilutive securities	396	4,565	320	4,588
Series A Convertible Preferred Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average antidilutive securities		4,051		2,026