Share-Based Compensation (Tables)
6 Months Ended
Jul. 28, 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
 
Twenty-Six Weeks Ended
 
July 28, 2012
 
July 30, 2011
 
July 28, 2012
 
July 30, 2011
 
(in thousands)
 
(in thousands)
Stock options
$
2,159

 
$
1,705

 
$
4,057

 
$
3,129

Restricted stock units and restricted stock
2,838

 
841

 
4,786

 
1,480

Restricted shares (equity issued pre-IPO)
3

 
61

 
13

 
144

Total share-based compensation
$
5,000

 
$
2,607

 
$
8,856

 
$
4,753

Schedule of Share-based Compensation, Activity [Table Text Block]
The Company's activity with respect to stock options during the twenty-six weeks ended July 28, 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
527

 
$
25.16

 
 
 
 
Exercised
(35
)
 
$
17.45

 
 
 
 
Forfeited or expired
(34
)
 
$
19.63

 
 
 
 
Outstanding, July 28, 2012
3,125

 
$
19.13

 
8.5

 
$
44

Expected to vest at July 28, 2012
2,162

 
$
19.78

 
8.6

 
$
33

Exercisable at July 28, 2012
929

 
$
17.56

 
8.1

 
$
11

Supplemental Options Data [Table Text Block]
The following provides additional information regarding the Company's stock options:
 
Twenty-Six Weeks Ended
 
July 28, 2012
(in thousands, except per share amounts)
 
Weighted average grant date fair value of options granted
$
13.43

Total intrinsic value of options exercised
$
267

Total fair value of options vested
$
6,171

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:

 
Twenty-Six Weeks Ended
 
July 28, 2012
 
July 30, 2011
Risk-free interest rate (1)
1.14
%
 
2.37
%
Price Volatility (2)
55.9
%
 
53.5
%
Expected term (years) (3)
6.16

 
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 twenty-six weeks ended July 28, 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
762

$
25.14

Vested
(168
)
$
17.75

Forfeited
(9
)
$
21.77

Unvested, July 28, 2012
1,485

$
21.97