Stock Option Activity (Parenthetical) (Detail) (Employee Stock Plan, 1992 Plan, USD $)	6 Months Ended
Aug. 03, 2013
Employee Stock Plan, 1992 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options exercised to purchase common stock	400,040
Share-based compensation arrangement, stock options intrinsic value	$ 183,000
Share-based compensation arrangement, shares issued	96,242

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration