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Stock-Based Compensation (Tables)
 3 Months Ended
Apr. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Summary of Restricted-Stock Awards and Restricted-Stock Units
The following table sets forth a summary of restricted stock unit activity for the thirteen weeks ended April 30, 2016 (units in thousands):
 
 
 
Time-based
Restricted Stock Units
 
Performance-based
Restricted Stock Units
 
 
Number of
Units
 
Weighted-
Average
Grant
Date Fair
Value
(per unit)
 
Number of
Units
 
Weighted-
Average
Grant
Date Fair
Value
(per unit)
Nonvested units outstanding at January 30, 2016
 
463

 
$
18.05

 
303

 
$
20.95

Granted
 
169

 
19.73

 
126

 
19.76

Vested
 
(131
)
 
18.58

 
—

 
—

Forfeited
 
—

 
—

 
(46
)
 
23.63

Nonvested units outstanding at April 30, 2016
 
501

 
$
18.48

 
383

 
$
20.24