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Share-Based Compensation (Tables)
 3 Months Ended
Apr. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
Stock option activity under the Plan was as follows:
 
Options
Outstanding
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
(in years)
Balance as of January 30, 2016
1,088,674

 
$
26.31

 
7.5
Granted
51,611

 
39.30

 
 
Forfeited
(11,250
)
 
38.06

 
 
Exercised
(88,654
)
 
12.70

 
 
Balance as of April 30, 2016
1,040,381

 
27.99

 
7.2
Exercisable as of April 30, 2016
508,272

 
$
20.25

 
6.3
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of each option award granted to employees, including outside directors, is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
 
Thirteen Weeks Ended
April 30, 2016
 
May 2, 2015
Expected volatility
47.6
%
 
47.0
%
Risk-free interest rate
1.6
%
 
1.8
%
Expected life of options
6.4 years

 
6.4 years

Expected dividend yield
—
%
 
—
%
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
RSU and PSU activity during the thirteen weeks ended April 30, 2016 was as follows:
 
Restricted Stock Units
 
Performance-Based Restricted Stock Units
 
Number
 
Weighted-Average Grant Date Fair Value
 
Number
 
Weighted-Average Grant Date Fair Value
Non-vested balance as of January 30, 2016
211,682

 
$
33.47

 
477,463

 
$
36.48

Granted
84,563

 
39.23

 
127,160

 
39.22

Vested
(645
)
 
38.71

 
(77,260
)
 
38.83

Forfeited
(5,511
)
 
32.09

 
—

 
—

Non-vested balance as of April 30, 2016
290,089

 
$
35.16

 
527,363

 
$
36.80