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Stock-Based Awards (Tables)
 12 Months Ended
Jan. 26, 2019
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 during fiscal 2019, the 2018 transition period, fiscal 2017, and fiscal 2016 were as follows (dollars in thousands):
 
Fiscal Year Ended
 
Six Months Ended
 
Fiscal Year Ended
 
January 26, 2019
 
January 27, 2018
 
July 29, 2017
 
July 30, 2016
Stock-based compensation
$
20,187

 
$
13,277

 
$
20,805

 
$
16,850

Recognized tax benefit of stock-based compensation
$
5,043

 
$
4,793

 
$
7,996

 
$
6,436
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 fiscal 2019, the 2018 transition period, fiscal 2017, and fiscal 2016 and the significant valuation assumptions:
 
Fiscal Year Ended
 
Six Months Ended
 
Fiscal Year Ended
 
January 26, 2019
 
January 27, 2018
 
July 29, 2017
 
July 30, 2016
Weighted average fair value of RSUs granted
$
97.90

 
$
87.34

 
$
79.04

 
$
72.41

Weighted average fair value of Performance RSUs granted
$
106.19

 
$
84.13

 
$
79.29

 
$
77.86

Weighted average fair value of stock options granted
$
48.19

 
$
42.60

 
$
39.90

 
$
45.13

Stock option assumptions:
 
 
 
 
 
 
 
Risk-free interest rate
2.7
%
 
2.3
%
 
2.3
%
 
2.0
%
Expected life (in years)
6.3

 
7.6

 
7.6

 
7.3

Expected volatility
43.3
%
 
43.4
%
 
44.7
%
 
55.0
%
Expected dividends
—

 
—

 
—

 
—
Schedule of Share-based Compensation, Stock Options Award Activity
The following table summarizes stock option award activity during fiscal 2019:
 
Stock Options
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life
(In years)
 
Aggregate Intrinsic Value
(In thousands)
Outstanding as of January 27, 2018
636,730

 
$
27.93

 
 
 
 
Granted
28,796

 
$
106.19

 
 
 
 
Options exercised
(82,235
)
 
$
10.59

 
 
 
 
Canceled
—

 
$
—

 
 
 
 
Outstanding as of January 26, 2019
583,291

 
$
34.24

 
4.4
 
$
17,785

 
 
 
 
 
 
 
 
Exercisable options as of January 26, 2019
512,871

 
$
26.43

 
3.9
 
$
17,785
Schedule of Share-based Compensation, RSU and Performance RSU Activity
The following table summarizes RSU and Performance RSU award activity during fiscal 2019:
 
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
62,477

 
$
97.90

 
218,628

 
$
106.19

Share units vested
(63,230
)
 
$
65.49

 
(173,139
)
 
$
79.84

Forfeited or canceled
(6,673
)
 
$
70.56

 
(58,462
)
 
$
75.34

Outstanding as of January 26, 2019
126,470

 
$
87.92

 
377,354

 
$
96.51