Shareholder's Equity - Summary of Service-Based Restricted Stock Awards and Units Activity (Detail) (USD $)	9 Months Ended
Oct. 27, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Outstanding at January 28, 2012	765,523
Granted shares	1,505,782
Vested Shares	(185,570)
Forfeited or expired shares	(267,511)
Shares Outstanding at October 27, 2012	1,818,224
Weighted-Average Grant-Date Fair Value Outstanding at January 28, 2012	$ 3.91
Weighted-average grant-date fair value granted	$ 1.76
Weighted-Average Grant-Date Fair Value Vested	$ 4.38
Weighted-Average Grant-Date Fair Value Forfeited or expired	$ 3.06
Weighted-Average Grant-Date Fair Value Outstanding at October 27, 2012	$ 2.21
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Outstanding at January 28, 2012	150,000
Granted shares	125,000
Vested Shares	(125,000)
Forfeited or expired shares	(25,000)
Shares Outstanding at October 27, 2012	125,000
Weighted-Average Grant-Date Fair Value Outstanding at January 28, 2012	$ 3.19
Weighted-average grant-date fair value granted	$ 1.57
Weighted-Average Grant-Date Fair Value Vested	$ 3.19
Weighted-Average Grant-Date Fair Value Forfeited or expired	$ 3.19
Weighted-Average Grant-Date Fair Value Outstanding at October 27, 2012	$ 1.57

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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