Share-Based Compensation (Tables)
9 Months Ended
Oct. 27, 2012
Share-based Compensation [Abstract]  
Schedule of Shared-based Compensation Expense [Table Text Block]
The following summarizes our share-based compensation expense:
 
Thirteen Weeks Ended
 
Thirty-Nine Weeks Ended
 
October 27, 2012
 
October 29, 2011
 
October 27, 2012
 
October 29, 2011
 
(in thousands)
 
(in thousands)
Stock options
$
2,032

 
$
1,669

 
$
6,089

 
$
4,798

Restricted stock units and restricted stock
1,318

 
1,049

 
6,104

 
2,529

Restricted shares (equity issued pre-IPO)
1

 
12

 
14

 
156

Total share-based compensation
$
3,351

 
$
2,730

 
$
12,207

 
$
7,483

Schedule of Share-based Compensation, Activity [Table Text Block]
The Company's activity with respect to stock options during the thirty-nine weeks ended October 27, 2012 was as follows:
 
 
Number of
Shares 
 
Grant Date
Weighted Average
Exercise Price
 
Weighted-Average Remaining Contractual Life
 
Aggregate Intrinsic Value
 
(in thousands, except per share amounts and years)
Outstanding, January 28, 2012
2,667

 
$
17.93

 
 
 
 
Granted
576

 
$
23.98

 
 
 
 
Exercised
(35
)
 
$
17.45

 
 
 
 
Forfeited or expired
(37
)
 
$
19.80

 
 
 
 
Outstanding, October 27, 2012
3,171

 
$
19.01

 
8.3

 
$

Expected to vest at October 27, 2012
2,180

 
$
19.61

 
8.4

 
$

Exercisable at October 27, 2012
961

 
$
17.63

 
7.9

 
$

Supplemental Options Data [Table Text Block]
The following provides additional information regarding the Company's stock options:
 
Thirty-Nine Weeks Ended
 
October 27, 2012
(in thousands, except per share amounts)
 
Weighted average grant date fair value of options granted
$
12.79

Total intrinsic value of options exercised
$
267

Total fair value of options vested
$
6,503

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of stock options was estimated at the grant date using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions:

 
Thirty-Nine Weeks Ended
 
October 27, 2012
 
October 29, 2011
Risk-free interest rate (1)
1.12
%
 
1.39
%
Price Volatility (2)
55.9
%
 
55.4
%
Expected term (years) (3)
6.17

 
6.25

Dividend yield (4)

 

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The Company's activity with respect to RSUs and restricted stock for the thirty-nine weeks ended October 27, 2012 was as follows:
 
 
Number of
Shares 
Grant Date
Weighted Average
Fair Value 
 
(in thousands, except per share amounts)
Unvested, January 28, 2012
900

$
18.52

Granted
826

$
24.13

Vested
(176
)
$
17.89

Forfeited
(12
)
$
21.83

Unvested, October 27, 2012
1,538

$
21.57