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Share-Based Compensation, Common Stock Issuances and Common Stock (Tables)
 12 Months Ended
Dec. 29, 2018
Weighted-Average Assumptions for Options Granted
The weighted-average assumptions for Options granted in fiscal years 2018, 2017 and 2016 are included in the following table.
 
2018
 
2017
 
2016
Expected volatility
35.7
%
 
31.8
%
 
28.8
%
Expected dividends
—

 
—

 
—

Risk-free interest rate
2.6
%
 
1.9
%
 
1.5
%
Expected term (in years)
5.4

 
5.8

 
5.9
Summary of Options Outstanding
The summary of Options outstanding and changes during fiscal year 2018 are presented below.
 
Time
Options
 
Performance
Options
 
Total
Options
 
Weighted-
Average Fair Value
 
Weighted-
Average Exercise Price
 
Weighted-
Average Remaining Contractual Years
Outstanding at December 30, 2017
3,009,552

 
1,605,417

 
4,614,969

 
$
7.47

 
$
18.79

 
 
Granted
680,863

 
365,381

 
1,046,244

 
$
14.55

 
$
28.69

 
 
Exercised
(726,989
)
 
(699,135
)
 
(1,426,124
)
 
$
6.55

 
$
14.34

 
 
Forfeited
(249,862
)
 
(48,831
)
 
(298,693
)
 
$
10.50

 
$
26.59

 
 
Outstanding at December 29, 2018
2,713,564

 
1,222,832

 
3,936,396

 
$
9.45

 
$
22.44

 
7.1
Vested and exercisable at December 29, 2018
1,103,649

 
883,591

 
1,987,240

 
$
7.55

 
$
17.97

 
6.1
Summary of Nonvested Restricted Shares
A summary of unvested RSUs outstanding and changes during fiscal year 2018 is presented below.
 
Time-Based
RSUs
 
Performance
RSUs
 
Total
RSUs
 
Weighted-
Average
Fair
Value
Unvested at December 30, 2017
909,292

 
276,553

 
1,185,845

 
$
26.79

Granted
564,951

 
269,116

 
834,067

 
$
33.48

Vested
(310,495
)
 
(127,276
)
 
(437,771
)
 
$
25.91

Forfeited
(126,907
)
 
(61,677
)
 
(188,584
)
 
$
29.45

Unvested at December 29, 2018
1,036,841

 
356,716

 
1,393,557

 
$
30.71
Performance Shares  
Summary of Nonvested Restricted Shares
The summary of unvested Performance Restricted Shares outstanding and changes during fiscal year 2018 is presented below: 
 
Performance Restricted
Shares
 
Weighted-
Average
Fair
Value
Unvested at December 30, 2017
$
241,313

 
$
30.39

      Granted
249,314

 
$
33.56

      Vested
—

 
$
—

      Forfeited
(41,804
)
 
$
31.90

Unvested at December 29, 2018
$
448,823

 
$
32.01