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Stock-Based Awards (Tables)
 6 Months Ended
Jan. 27, 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 2018 transition period and fiscal 2017, 2016, and 2015 were as follows (dollars in thousands):
 
Six Months Ended
 
Fiscal Year Ended
 
January 27, 2018
 
July 29, 2017
 
July 30, 2016
 
July 25, 2015
Stock-based compensation
$
13,277

 
$
20,805

 
$
16,850

 
$
13,923

Income tax effect of stock-based compensation
$
4,793

 
$
7,996

 
$
6,436

 
$
5,458


In addition, as a result of the Company’s application of ASU 2016-09, the Company recognized approximately $7.8 million of certain tax benefits from share-based award activities during the 2018 transition period.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the valuation of stock options and restricted share units granted during the 2018 transition period and fiscal 2017, 2016, and 2015 and the significant valuation assumptions:
 
Six Months Ended
 
Fiscal Year Ended
 
January 27, 2018
 
July 29, 2017
 
July 30, 2016
 
July 25, 2015
Weighted average fair value of RSUs granted
$
87.34

 
$
79.04

 
$
72.41

 
$
31.42

Weighted average fair value of Performance RSUs granted
$
84.13

 
$
79.29

 
$
77.86

 
$
31.03

Weighted average fair value of stock options granted
$
42.60

 
$
39.90

 
$
45.13

 
$
19.48

Stock option assumptions:
 
 
 
 
 
 
 
Risk-free interest rate
2.3
%
 
2.3
%
 
2.0
%
 
2.1
%
Expected life (in years)
7.6

 
7.6

 
7.3

 
8.8

Expected volatility
43.4
%
 
44.7
%
 
55.0
%
 
54.5
%
Expected dividends
—

 
—

 
—

 
—
Schedule of Share-based Compensation, Stock Options Award Activity
The following table summarizes stock option award activity during the 2018 transition period:
 
Stock Options
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life
(In years)
 
Aggregate Intrinsic Value
(In thousands)
Outstanding as of July 29, 2017
670,350

 
$
25.24

 
 
 
 
Granted
18,933

 
$
85.15

 
 
 
 
Options exercised
(52,553
)
 
$
14.17

 
 
 
 
Canceled
—

 
$
—

 
 
 
 
Outstanding as of January 27, 2018
636,730

 
$
27.93

 
4.8
 
$
58,176

 
 
 
 
 
 
 
 
Exercisable options as of January 27, 2018
549,507

 
$
21.63

 
4.2
 
$
53,670
Schedule of Share-based Compensation, RSU and Performance RSU Activity
The following table summarizes RSU and Performance RSU award activity during the 2018 transition period:
 
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
29,672

 
$
87.34

 
138,261

 
$
84.13

Share units vested
(80,884
)
 
$
51.49

 
(272,466
)
 
$
57.98

Forfeited or canceled
(2,357
)
 
$
81.62

 
(29,350
)
 
$
60.32

Outstanding as of January 27, 2018
133,896

 
$
71.81

 
390,327

 
$
80.52