Stock Based Compensation (Detail) - Summary of stock award activity (USD $)	9 Months Ended
	Oct. 27, 2012
Balance January 28, 2012	6,126,851
Balance January 28, 2012 (in Dollars per share)	$ 6.28
Balance January 28, 2012	3.6
Balance January 28, 2012	362,444	[1]
Balance January 28, 2012 (in Dollars per share)	$ 2.71
Granted	305,000
Granted (in Dollars per share)	$ 2.76
Granted	9.6
Exercised	(279,898)	[1]
Exercised (in Dollars per share)	$ 1.63
Exercised	(48,280)
Exercised (in Dollars per share)	$ 2.80
Forfeited	(150,000)
Forfeited (in Dollars per share)	$ 2.31
Canceled(2)	(884,882)	[2]
Canceled(2) (in Dollars per share)	$ 8.03	[2]
Balance October 27, 2012	5,348,689
Balance October 27, 2012 (in Dollars per share)	$ 5.84
Balance October 27, 2012	3.6
Balance October 27, 2012	82,546	[1]
Balance October 27, 2012 (in Dollars per share)	$ 6.35
Exercisable October 27, 2012	4,108,689
Exercisable October 27, 2012 (in Dollars per share)	$ 6.89
Exercisable October 27, 2012	2.2
Exercisable October 27, 2012	82,546	[1]
Exercisable October 27, 2012 (in Dollars per share)	$ 6.35

[1] Other Share Awards include deferred shares granted to Directors and restricted stock units issued to employees.

[2] Cancelled options are primarily comprised of expired options.