Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Equity and Incentive Compensation Plans - Summary of Restricted Stock Activity (Parenthetical) (Detail)	3 Months Ended	9 Months Ended
	Oct. 27, 2012 Performance-Based Restricted Stock Awards [Member]	Oct. 27, 2012 Performance-Based Restricted Stock Awards [Member] Minimum [Member]	Oct. 27, 2012 Performance-Based Restricted Stock Awards [Member] Maximum [Member]	Oct. 27, 2012 Shares Vesting in May 2013 [Member] Time-Based Restricted Stock Award [Member]	Oct. 27, 2012 Share Vesting In March 2013 March 2014 and March 2015 Time-Based Restricted Stock Award [Member]	Oct. 27, 2012 Shares Vesting in Sept 2013 Sept 2014 And Sept 2015 [Member] Time-Based Restricted Stock Award [Member]	Oct. 27, 2012 Share Vesting in March 2013 and March 2014 Time-Based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares expected to vest				41,187	257,375	5,000	4,000
Restricted stock awards annual vesting period	3 years
Percentage grantees earn of the value granted with respect to each tranche of the grant		50.00%	150.00%