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Stock-Based Awards (Tables)
 3 Months Ended
Oct. 28, 2017
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 related to stock options and restricted share units during the three months ended October 28, 2017 and October 29, 2016 were as follows (dollars in thousands):
 
For the Three Months Ended
 
October 28, 2017
 
October 29, 2016
Stock-based compensation
$
7,380

 
$
5,707

Related tax benefit for stock-based compensation
$
2,882

 
$
2,183


In addition, as a result of the Company’s adoption of ASU 2016-09, the Company recognized approximately $0.9 million of certain tax benefits from share-based award activities during the three months ended October 28, 2017.
Schedule of Share-based Compensation, Stock Options Award Activity
The following table summarizes stock option award activity during the three months ended October 28, 2017:
 
Stock Options
 
Shares
 
Weighted Average Exercise Price
Outstanding as of July 29, 2017
670,350

 
$
25.24

Granted
18,933

 
$
85.15

Options exercised
(21,325
)
 
$
9.57

Canceled
—

 
$
—

Outstanding as of October 28, 2017
667,958

 
$
27.44

 
 
 
 
Exercisable options as of October 28, 2017
518,053

 
$
18.70
Schedule of Share-based Compensation, RSU and Performance RSU Activity
The following table summarizes RSU and Performance RSU award activity during the three months ended October 28, 2017:
 
Restricted Stock
 
RSUs
 
Performance RSUs
 
Share Units
 
Weighted Average Grant Price
 
Share Units
 
Weighted Average Grant Price
Outstanding as of July 29, 2017
187,465

 
$
60.71

 
553,882

 
$
67.46

Granted
25,227

 
$
85.31

 
138,261

 
$
84.13

Share units vested
(9,218
)
 
$
62.66

 
(36,121
)
 
$
56.08

Forfeited or canceled
—

 
$
—

 
(24,753
)
 
$
57.32

Outstanding as of October 28, 2017
203,474

 
$
63.67

 
631,269

 
$
72.16