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Stock-Based Awards (Tables)
 6 Months Ended
Jul. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-based Compensation Expense and Related Tax Benefit Recognized
Stock-based compensation expense and the related tax benefit recognized and realized during the three and six months ended July 28, 2018 and July 29, 2017 were as follows (dollars in thousands):
 
For the Three Months Ended
 
For the Six Months Ended
 
July 28, 2018
 
July 29, 2017
 
July 28, 2018
 
July 29, 2017
Stock-based compensation
$
6,048

 
$
4,874

 
$
10,911

 
$
9,789

Income tax effect of stock-based compensation
$
1,420

 
$
1,870

 
$
2,489

 
$
3,813
Schedule of Share-based Compensation, Stock Options Award Activity
The following table summarizes stock option award activity during the six months ended July 28, 2018:
 
Stock Options
 
Shares
 
Weighted Average Exercise Price
Outstanding as of January 27, 2018
636,730

 
$
27.93

Granted
28,796

 
$
106.19

Options exercised
(34,442
)
 
$
11.05

Canceled
—

 
$
—

Outstanding as of July 28, 2018
631,084

 
$
32.43

 
 
 
 
Exercisable options as of July 28, 2018
515,065

 
$
22.34
Schedule of Share-based Compensation, RSU and Performance RSU Activity
The following table summarizes RSU and Performance RSU award activity during the six months ended July 28, 2018:
 
Restricted Stock
 
RSUs
 
Performance RSUs
 
Share Units
 
Weighted Average Grant Price
 
Share Units
 
Weighted Average Grant Price
Outstanding as of January 27, 2018
133,896

 
$
71.81

 
390,327

 
$
80.52

Granted
51,380

 
$
103.36

 
218,628

 
$
106.19

Share units vested
(4,449
)
 
$
78.74

 
—

 
$
—

Forfeited or canceled
(6,673
)
 
$
70.56

 
(27,434
)
 
$
87.29

Outstanding as of July 28, 2018
174,154

 
$
80.99

 
581,521

 
$
89.85