Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Feb. 02, 2013		Jan. 28, 2012
Employee Stock Plan, 2006 Plan
Number of Shares
Outstanding at beginning of year	1,073,971
Options granted	66,286
Options canceled	(763,883)
Outstanding at end of year	376,374
Vested and expected to vest at end of year	366,100
Options exercisable at end of year	300,891
Weighted-average Exercise price per Option
Outstanding at beginning of year	$ 4.56
Options granted	$ 3.45
Options canceled	$ 4.58
Outstanding at end of year	$ 4.31
Vested and expected to vest at end of year	$ 4.32
Options exercisable at end of year	$ 4.50
Weighted Average Remaining Contractual Term (Years)
Outstanding at end of year	6 years 8 months 12 days
Vested and expected to vest at end of year	6 years 8 months 12 days
Options exercisable at end of year	6 years
Aggregate Intrinsic Value
Outstanding options at end of year	$ 227,551
Vested and expected to vest at end of year	221,199
Options exercisable at end of year	$ 146,517
Employee Stock Plan Nineteen Ninety Two Plan
Number of Shares
Outstanding at beginning of year	1,762,426
Options granted			500,000
Options canceled	(362,611)
Options exercised	(70,000)	[1]
Outstanding at end of year	1,329,815		1,762,426
Vested and expected to vest at end of year	1,329,815
Options exercisable at end of year	1,329,815
Weighted-average Exercise price per Option
Outstanding at beginning of year	$ 5.93
Options canceled	$ 4.95
Options exercised	$ 3.15	[1]
Outstanding at end of year	$ 6.35		$ 5.93
Vested and expected to vest at end of year	$ 6.35
Options exercisable at end of year	$ 6.35
Weighted Average Remaining Contractual Term (Years)
Outstanding at end of year	1 year 3 months 18 days
Vested and expected to vest at end of year	1 year 3 months 18 days
Options exercisable at end of year	1 year 3 months 18 days

[1] Includes options that were exercised through net share settlement. As a result, only 21,751 shares were issued with no corresponding option cost.