Stock Compensation Plans - Stock Option Activity under Two Thousand Six Plan (Detail) - Employee Stock Plan, 2006 Plan	12 Months Ended
	Jan. 30, 2016 USD ($) $ / shares shares
Number of Shares
Outstanding options at beginning of year | shares	2,747,802
Options granted | shares	63,242
Options canceled | shares	(60,287)
Options exercised | shares	(22,136)
Outstanding options at end of year | shares	2,728,621
Options exercisable at end of year | shares	1,040,220
Vested and expected to vest at end of year | shares	1,547,453
Weighted-average exercise price per option
Outstanding options at beginning of year | $ / shares	$ 4.97
Options granted | $ / shares	5.84
Options canceled | $ / shares	5.04
Options exercised | $ / shares	4.59
Outstanding options at end of year | $ / shares	5.00
Options exercisable at end of year | $ / shares	4.88
Vested and expected to vest at end of year | $ / shares	$ 4.94
Weighted-average remaining contractual term
Outstanding options at end of year	7 years
Options exercisable at end of year	6 years 3 months 18 days
Vested and expected to vest at end of year	6 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding options at end of year | $	$ 123,181
Options exercisable at end of year | $	103,513
Vested and expected to vest at end of year | $	$ 123,181