Stock-based Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Options/SARs shares [Roll Forward]
Outstanding at beginning of period			6,098,153
Granted - exercise price equal to market price			2,492,133
Canceled/forfeited			(827,041)
Exercised			(1,622,562)
Outstanding at end of period	6,140,683		6,140,683
Exercisable at end of period	1,469,717		1,469,717
Weighted average exercise price [Abstract]
Outstanding at beginning of period (in dollars per share)			$ 3.10
Granted - exercise price equal to market price (in dollars per share)	$ 3.97		$ 3.97
Canceled/forfeited (in dollars per share)			$ 5.02
Exercised (in dollars per share)	$ 1.80		$ 1.80
Outstanding at end of period (in dollars per share)	$ 3.53		$ 3.53
Exercisable at end of period (in dollars per share)	$ 3.26		$ 3.26
Aggregate intrinsic value [Abstract]
Outstanding at beginning of period			$ 0
Exercised			2,184
Outstanding at end of period	156		156
Exercisable at end of period	447		447
Stock-based compensation expense [Abstract]
Stock-based compensation expense, excluding cash-settled RSUs	1,409	1,656	3,796	3,666
Stock-based compensation expense, cash-settled RSUs	0	0	0	4
Total stock-based compensation expense	1,409	1,656	3,796	3,670
Compensation expense not yet recognized [Abstract]
Stock-based compensation expense not yet recognized	$ 11,988		$ 11,988
Weighted-average period over which expense is expected to be recognized (in years)			3
Outstanding at beginning of period [Member]
Range of exercise prices per share [Abstract]
Range, lower limit (in dollars per share)			$ 1.00
Range, upper limit (in dollars per share)			$ 13.84
Inducement grants [Abstract]
Outstanding at beginning of period (in shares)			1,416,496
Granted - exercise price equal to market price [Member]
Range of exercise prices per share [Abstract]
Range, lower limit (in dollars per share)			$ 2.71
Range, upper limit (in dollars per share)			$ 4.37
Canceled/forfeited [Member]
Range of exercise prices per share [Abstract]
Range, lower limit (in dollars per share)			$ 1.00
Range, upper limit (in dollars per share)			$ 13.84
Exercised [Member]
Range of exercise prices per share [Abstract]
Range, lower limit (in dollars per share)			$ 1.00
Range, upper limit (in dollars per share)			$ 2.93
Inducement grants [Abstract]
Exercised (in shares)			825,000
Outstanding at end of period [Member]
Range of exercise prices per share [Abstract]
Range, lower limit (in dollars per share)			$ 1.00
Range, upper limit (in dollars per share)			$ 11.28
Inducement grants [Abstract]
Outstanding at end of period (in shares)	591,496		591,496
Exercisable at end of period [Member]
Range of exercise prices per share [Abstract]
Range, lower limit (in dollars per share)			$ 1.00
Range, upper limit (in dollars per share)			$ 11.28
Inducement grants [Abstract]
Exercisable at end of period (in shares)	207,164		207,164
Stock Award and Incentive 2010 Plan [Member]
Shares available for future grants [Abstract]
Shares available for future grants (in shares)	5,078,476		5,078,476
Employee Stock Purchase 1994 Plan [Member]
Shares available for future grants [Abstract]
Shares available for future grants (in shares)	301,699		301,699