Summary of Activity for Non-vested Shares (Restricted Shares) (Parenthetical) (Detail) (Employee Stock Plan, 2006 Plan, USD $)	9 Months Ended
Nov. 01, 2014
Employee Stock Plan, 2006 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	8,345
Shares granted during the period, fair value	$ 43,561

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration