Stock Option Activity under Two Thousand Six Plan (Detail) (Employee Stock Plan, 2006 Plan, USD $)	3 Months Ended
	May 03, 2014
Employee Stock Plan, 2006 Plan
Number of Shares
Outstanding at beginning of year	2,721,569
Options granted
Options canceled	(78,695)
Options exercised
Outstanding at end of quarter	2,642,874
Options exercisable at end of quarter	347,716
Weighted-average Exercise price per Option
Outstanding at beginning of year	$ 4.95
Options granted
Options canceled	$ 5.04
Options exercised
Outstanding at end of quarter	$ 4.95
Options exercisable at end of quarter	$ 4.60
Weighted-average Remaining Contractual Term
Outstanding options at end of quarter	8 years 6 months
Options exercisable at end of quarter	4 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding options at end of quarter	$ 1,032,622
Options exercisable at end of quarter	$ 339,698